Immense Space..

Space is amazing and there’s a lot to wonder about it. Space is really vast and its vastness is incomprehensible to us. Below are some updated , incredible and awesome facts about space along with images and further i think you will find this article cool and interesting. Enjoy the post and do suggest me for betterment of posts and article.

1 )  Origin Of Earth’s Water :


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Earth , the only planet supporting life. It is the only planet where water exists in all three forms i.e. Solid Liquid & Gas. About 70% of Earth is covered with water and this is the reason it is known as Blue Planet.

Do you Know Origin Of Earth’s Water is still unknown to us in complete sense. There are numerous hypotheses on how the water accumulated on the Earth’s surface over the past 4.6 billion years in sufficient quantity to form oceans.

2 )  Farthest Space Probe :


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Voyager 1 is the only space probe which has traveled beyond solar system and the only one in interstellar space. Launched by NASA on September 5, 1977 Voyager 1 is at a distance of about 134 AU (2.00×1010 km) as of winter 2016.

3 ) Star Approaching Towards Our Solar System :


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Gliese 445 (Gl 445) , an M-type main sequence star , is approaching towards our solar system at about 119 km/s (430,000 km/h; 270,000 mph). The star is currently 17.6 light-years from the Sun and is in the constellation named Camelopardalis, close to Polaris.

NASA’s Voyager 1 spacecraft, which is out of our solar system, is headed towards Gliese 445 and in about 40,000 years, Voyager 1 will be closer to this star than our own sun.

4 )  Liquid Water On Celestial Objects :

Apart from Earth which has water in all the three states , there are possibilities that other celestial bodies too have liquid water. Possible Planets and Moon’s possessing liquid water are :

Mars , Europa (Jupiter’s Moon) , Ganymede (Jupiter’s Moon) , Enceladus (Saturn’s Moon)

Apart from this there are numerous other star systems and extra-solar planets which may have liquid water as well as posses habitable zone.

5 ) Sunset On Mars :


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Sunset on Mars taken by NASA’s Spirit Rover in 2005.Both blue aureole and pink sky are seen. Because of the fine nature of Martian dust, it can scatter blue light coming from the Sun forward towards the observer.

6 )  Average Distance Between Earth And Moon :


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Average distance between Earth and Moon is 384400 km. We can place all the planets of solar system within this average distance between earth and moon.

distance between earth and moon

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7 )  Earth’s Image From Edge Of Solar System :


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As discussed earlier Voyager 1 is the farthest space probe sent from earth and as a result of which we have got an image of Earth from edge of the solar system. This tiny dot, amid a band of coloured rays, is our planet, as seen from staggering distance of 11,100,000,000 miles away, and pictured in 1990.

8 ) Most Distant Object Seen By Naked Eyes :


Andromeda Galaxy is the most distant object you can see with your naked eyes, two million light years away. It is visible as a dim, fuzzy star from a dark sky site.


Now is the time to look some spectacular images of different countries and continents in night from space.


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World At Night :

Europe :


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African Continent :


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Australia :


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Japan And Eastern China :


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South America :


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Middle East :


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Russia :


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Indian Sub-continent  :


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So This Is Space And There’s Lot And Lot To Wonder About It. We Know Space Is Vast , But Don’t Know How Much Vast , But One Thing We Know Is It’s Beautiful. Enjoy Reading……

[Content Source : , , , , http://www.universetoday.com ,



NASA’s MAVEN Mission And Its Achievement..

Mars Atmosphere And Volatile Evolution (MAVEN) 


[This Is Artist’s Rendering Of The MAVEN Spacecraft ,  Image Credit :]

MAVEN was a space probe designed to study atmosphere of Mars while Orbiting It. It was Launched On November 18, 2013.

MAVEN Reached Mars On September 22, 2014 and orbited it around 6100 km above its surface.

The Primary Objectives of MAVEN were to :

1 ) Examine and determine causes behind change in climatic conditions.

2 ) Investigate current state of the atmosphere’s different layers.

3 ) Determine interaction of atmosphere with Solar Winds and How the sun might have influenced atmospheric changes on the Red Planet. .

4 ) Determine the rate at which neutral gases and ions escape to space and the processes controlling them.

5 ) Determine how much of the planet’s atmosphere and water have been lost to space.

MAVEN is still Operational and will continue its focus on primary objectives.

Achievement :

After 1 year of orbiting Mars , MAVEN has given significant and really helpful results. NASA’s Scientists unlocked the reason behind stripping atmosphere of Mars.

Mars was believed to have thick atmosphere earlier. This atmosphere helped in keeping planet warm enough to support water in liquid state. Liquid water is a key medium and ingredient for life.

MAVEN orbiter mission has determined that ancient Mars suffered drastic climate change and lost its thick atmosphere and surface bodies , which were believed of potentially life giving liquid water because of Solar Winds.

mars atmosphere

[ Artist’s rendering of a solar storm hitting Mars and stripping ions from the planet’s upper atmosphere. ]
[Image Credits: NASA/GSFC , ]

Solar Winds were reason behind tremendous loss of quantities of gas to space , based on new findings that were announced on, Nov. 5, at a NASA media briefing and in a series of scientific publications.

MAVEN Orbiter Mission helped a lot to study Martian atmosphere and still in operation for further investigation. According to NASA , MAVEN will complete its primary science mission on Nov. 16.

MAVEN Orbiter Mission

  • Measurements indicate that the solar wind drives away gas at a rate of about 100 grams (equivalent to roughly 1/4 pound) every second.
  • Found that atmospheric erosion increases significantly during solar storms.
  • Found that billions of years ago the loss rate was much higher due to the sun was young and more active.
  • Saw mars atmosphere got hit by solar storms in March 2015 and the loss was accelerated.
  • Found that combination of greater loss rates and increased solar storms in the past , results in loss of atmosphere to space and is likely a major process in changing the Martian climate.
  • Indicates that the loss is experienced in three different regions of the Red Planet: down the “tail,” where the solar wind flows behind Mars, above the Martian poles in a “polar plume,” and from an extended cloud of gas surrounding Mars.

In Future : 

MAVEN will complete its primary objectives up-to or on Nov. 16 and we will study Martian atmosphere in more details.

Understanding what happened to the Mars atmosphere will inform our knowledge of the dynamics and evolution of any planetary atmosphere.

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Amazing And Updated Outer Space Facts…. 2

milky way galaxy

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As the technology keeps on advancing so does our understanding of Universe. Scientists are trying hard to unlock the mysteries of outer space. Earlier in Space And Astronomy category I wrote a post displaying Amazing And Updated Outer Space Facts. Now , I have listed other facts on outer space or universe in the heading :

” Amazing And Updated Outer Space Facts..2 “

1 ) Earth Is Only Best Known Planet In Universe Till Now :


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Well That’s True : Our Earth is the only planet in the solar system or universe which is best known to us. No other celestial body is well studied this much. Even Mars and our own natural satellite is still unknown in many terms to us but we will keep studying other celestial bodies to unlock mysteries.

2 ) Exploration From Earth :


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Maximum discoveries of the celestial bodies before the installation of Hubble Telescope were made from earth.

3 ) Essential Elements Of Life (Classical Elements) :


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According to the ancient philosophers or mythology , there are 5 most important essential things of which anything can consists and of which the constitution and fundamental powers of everything are based. These essentials are known as Classical Elements. The 5 important Classical Elements are : Earth , Air , Water , Fire and Sky or Space .

4 ) Essential Elements Of Life (Today’s Thinking) :

Chnops diagram

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According to today’s thinking , there are six most important chemical elements whose covalent combinations make up most biological molecules on Earth. These 6 Elements are : Carbon , Hydrogen , Nitrogen , Oxygen , Phosphorus and Sulfur.

5 ) Hydrogen , The Most Abundant Element :


[Image Credit : (Hydrogen) , (Helium)]

How big is universe , it is yet to be understood but , as far as the understanding of availability of elements in observable Space is concerned , 74% of the mass of the visible universe is in the form of hydrogen. Helium comes next occupying 24% Of Observable Universe followed by other heavy elements in small percentage.

6 )  Distribution Of Matter and Energy in the Universe :

distribution of energy

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Well !!! we can tell distribution of energy  and matter in universe by looking at above picture. It is estimated that Universe is covered 68% with Dark Energy , 27%  with dark matter and rest other 5% is covered by ordinary matter.

7 ) Mysteries :

We haven’t seen Dark Matter and Dark Energy yet. But there presence influence a lot.

8 ) Dark Energy : 

Dark energy is unknown form of energy the most accepted hypothesis to explain the observations since the 1990s indicating that the universe is expanding at an accelerating rate.

9 ) Evidence Of Existence Of Dark Energy :

Evidence of dark energy came from the observations in 1998 of  Type Ia supernovae (“one-A”) by the High-Z Supernova Search Team followed and in 1999 by the Supernova Cosmology Project suggested that the expansion of the universe is accelerating. Thus is was assumed that Some kind of unknown force or energy is causing it and name was given Dark Energy.

10 ) Dark Matter :

Dark matter is invisible and a hypothetical kind of matter that cannot be seen. The existence and properties of dark matter are inferred from its gravitational effects on visible matter, on radiation, and on the large-scale structure of the universe. Dark matter has not been detected directly, making it one of the greatest mysteries in modern astrophysics.

Hope You Enjoy Every Bit Of Information. Thank You..

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Learning From Aged …

old man

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We almost learn something everyday. It doesn’t matter whether we learn it in the field of academics or day to day life , but we learn. We learn from each other. Similarly we learn from the aged people too. I am really really small to talk about ” Learning From Aged People ”  , but believe me i am talking about this topic as a grandchildren.

Once my grandfather asked me to take him to our relatives for sometime ( since he does not drive therefore he asked me ) .

We reached at destination where my cousins grandfather welcomed my grandfather and blessed me. I was the only one small since my cousins were somewhere out.

I sat near them and since i was the only one and no other of my age , i paid my attention to there conversation.

They started from general well wishing to politics , developments , religion , social life , communities , various ceremonies , charity , education , health fitness , family and the time when they were young. I heard each and every word and about every topic.

The time when they started talking about there young age , i took more interest in hearing that. What i learned was , how they suffered during there young age and struggled for there life.

Both of them saw hard life not in there own life but others too. They both suffered from lack of medical support to bad weather , they both suffered Emergency of 1975-77 , they were witness of wars India fought with Pakistan and China (although they are civilians and not at all involved in war , but talked about it )  , they saw several other political up-downs in state and country , they talked about there education and other topics. They shared there struggle in raising there loved ones.

All these things made me learn something from my grandparents and other aged people too.  This is what i am trying to say in this post that ” We Learn Many and Much From Aged People ” .

These aged people are authority figure , and when Talking about grandchild and grandparents , relation between them is a special one.

We can learn many things but i have mentioned 10 Points We Learn From Elderly People. I took the help of and , so as to find good words and better content.


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Check 10 things we can Learn From Aged people.

  • Support : They better Understand how to support other. When it comes to grandparents , they will be with you always to support. Even when parents are angry , grandparents are there on your side.
  • Experience : They are highly experienced in many many fields as they have seen the world more. One may argue that ; They are expert in using things like technology , but Aged are experienced in handling it.
  • Accepting : They have seen more people and knows that how varied people are and teaches how to accept difference.
  • Dealing : They better know how to deal with problems. It is not necessary that they solved every problem of there life but they do know about such dilemma.
  • Strength : They survived and struggled so definitely there have best strength.
  • Patience : This teach us how to keep patience. They have it in them from very long time.
  • Understanding Community : They know what role a community plays in ones life. They teaches us how to survive in unity with community.
  • History : Well !! , In my previous post i mentioned importance of History. You may ignore History in academics but you can hear it from your Grandparents and Other Aged People. They actually lived History.
  • Decision : They suffered may situations and made decisions to survive odds. This is what they teach to us i.e. How to make decisions. Whatever the outcome of our Decision may be , but we took one option.
  • Courage : They teaches us to have courage. Since they had courage to face difficulties , they teaches us same.

Grandparents or other Aged people , they tell us how to live and love each other.

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Why learn History …?


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History , a subject which tells us What happened in Past , How It happened , What started it to happen , Who Was responsible for it and many ..

I found an interesting article answering , Why History Is Important To Study on :

I posted this article for those who think History is a subject of merely dates and figures of past happenings.

Well !!!  For those who question , Is History really important , An answer to this question is :

Yes , It is important. Now the Question comes Why :

Why is History important to study and also the Historians are often asked :What is the use or relevance of studying History ? Why on earth does it matter what happened long ago ?

The answer to this question is beautifully given by Penelope Corfield an Emeritus Professor, attached to the History Department of Royal Holloway :

History is inescapable. It studies the past and the legacies of the past in the present. Far from being a ‘dead’ subject, it connects things through time and encourages its students to take a long view of such connections.

All people and peoples are living histories. To take a few obvious examples:

Communities speak languages that are inherited from the past. They live in societies with complex cultures, traditions and religions that have not been created on the spur of the moment. People use technologies that they have not themselves invented. And each individual is born with a personal variant of an inherited genetic template, known as the genome, which has evolved during the entire life-span of the human species.

So understanding the linkages between past and present is absolutely basic for a good understanding of the condition of being human. Nothing can be undertaken well without understanding the context and starting points. That is why History is not just ‘useful’, it is essential.

When i further looked into importance of history i found an another good answer by Sanjay Aathreyasa at :

  • There is this thing with history, you will never know when you are making it or being part of it.
  • History introduces us to more interesting people, than we possibly meet in our restricted lives.
  • It is not the mass that invents and not the majority that organizes or thinks but in all things, it is always and only the individual man, the person.
  • Most of the world history is made by secret handshakes than by battles, bills, proclamations or negotiations.
  • As humans we never seem to rise above our own greed, hatred, bloodlust, desire for power. They lead us to play out same scenarios over and over again and hence history repeats itself.
  • History is the story of how we became who we are.

Looking at these answers we can tell that How history is really important. History is not just useful , it is essential.

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Seeds Of Life In The Universe

Life we see today whether it is our life , plants life , animals life or any other living organism’s live  , it makes us to think , How the first life originated on earth , How it looked like , When it Started and many  many questions..

small plants

Google these questions and you will that there is no single correct answer.

How life originated is still a problem to be solved. There are many theories explaining the origin of life but the facts supporting these ideas are few.

It  is generally agreed that all the living forms today evolved around 3,900 million years ago from single primitive lifeform. Now from where this lifeform came about is again a mystery.

However scientists think that it was a natural process. From all these uncountable things , one thing is real , that is there are few elements which are very important for the life. For example : carbon, hydrogen, nitrogen, oxygen, phosphorus, sulfur  (stands for acronym CHNOPS )

These Elements can be said as Seeds Of Life.

According to the new survey of hot, X-ray-emitting gas in the Virgo galaxy cluster , elements important for life on Earth are available in similar relative proportions throughout the bulk of the universe.

The elements needed to make stars, planets and people were evenly distributed across millions of light-years early in cosmic history, more than 10 billion years ago, researchers said.

The Virgo cluster, located about 54 million light-years away, is the nearest galaxy cluster and the second brightest in X-rays.The cluster is home to more than 2,000 galaxies, and the space between them is filled with a diffuse gas so hot it glows in X-rays.

The observations were taken at the Japan Aerospace Exploration Agency (JAXA) in Sagamihara by using Japan’s Suzaku X-ray satellite. The team for this purpose was led by Aurora Simionescu, an astrophysicist at JAXA. Researchers accquired observations of the cluster along four arms extending up to 5 million light-years from its centre.

Different classes of supernovae produce different chemical compositions. Core-collapse supernovae mostly scatter elements ranging from oxygen to silicon, while white dwarf explosions release predominantly heavier elements, such as iron and nickel.

Once the chemical elements made by supernovae are scattered and mixed into interstellar space, they become incorporated into later generations of stars.

In an earlier study led by Norbert Werner, from the Kavli Institute for Particle Astrophysics and Cosmology (KIPAC) at Stanford University, Suzaku data showed that iron was distributed uniformly throughout the Perseus Galaxy Cluster, but information about lighter elements mainly produced by core-collapse supernovae was unavailable.

The Virgo Cluster observations supply the missing ingredients.

Simionescu and her colleagues showed they detect iron, magnesium, silicon and sulphur all the way across a galaxy cluster for the first time.

The elemental ratios are constant throughout the entire volume of the cluster and roughly consistent with the composition of the Sun and most of the stars in our own galaxy, researchers said.

The study shows that the chemical elements in the cosmos are well mixed, showing little variation on the largest scales.

The same ratio of supernova types – the same recipe – thought to be responsible for the solar system’s makeup was at work throughout the universe.

“This means that elements so important to life on Earth are available, on average, in similar relative proportions throughout the bulk of the universe,” said Simionescu.

The findings appear in The Astrophysical Journal Letters.

Story First Published: October 27, 2015 12:51 IST
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Pluto In Light…

Pluto , Once which was considered as the ninth planet and the most distant planet from the sun, is now the largest known dwarf planet in the solar system.

pluto nasa image

[ Image Source : NASA-JHUAPL-SWRI ]

Pluto which was limited to the humans in terms of  Geography , Orbit shape , Images (although artistic images were present) etc , has again attracted from astronomers to the common people now. I would say it is PLUTO’S REVENGE for reclassifying it as Dwarf Planet from simply a Planet. NASA’s New Horizons sent a better and new view of Pluto Via Pictures. After more than nine years and billion miles of journey it’s the show time for NASA’s New Horizons spacecraft.

Look !! How was the reaction of NASA’s New Horizons Team Members after new  pictures of Pluto were received..


[ Image Source : , NASA ]

Read and enjoy Some facts about Pluto and let yourself know about this planet in more detail.

  • Pluto was discovered in 1930 on February 18 by Clyde Tombaugh, and was originally considered the ninth planet from the Sun.

Clyde W. Tombaugh

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  • Discovery of Eris in 2005  led the International Astronomical Union (IAU) to define the term “Planet” formally for the first time the following year.
  • This definition excluded Pluto and reclassified it as a member of the new “dwarf planet” category (and specifically as a plutoid).
  • Pluto is a dwarf planet in the Kuiper belt, a ring of bodies beyond Neptune.


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  • The name Pluto, after the god of the underworld, was proposed by Venetia Burney (1918–2009).
  • She was then eleven-year-old schoolgirl in Oxford, England, who was interested in classical mythology.
  • Venetia Burney suggested name ” Pluto” in a conversation with her grandfather Falconer Madan, a former librarian at the University of Oxford’s Bodleian Library, who passed the name to astronomy professor Herbert Hall Turner and he further passed it to his colleagues in the United States.
  • A small Voting was held and each member of Lowell Observatory was allowed to vote to decide name of the object out of short-list of three: Minerva (which was already the name for an asteroid), Cronus and Pluto at Lowell Observatory.
  • Pluto received every vote and thus the name was kept.
  • The object was officially named on March 24, 1930.
  • Falconer Madan grandfather of  Venetia gave her £5 (equivalent to 300 GBP, or 450 USD in 2015) as a reward.
  • Minor Planet Catalogue  designation of Pluto is : 134340 Pluto
  • Pluto was the first Kuiper belt object to be discovered.
  • It is the largest known dwarf planet in the Solar System.
  • It is the second-most-massive dwarf planet in the Solar System.
  • It is ninth-largest known object directly orbiting the Sun.
  • It is the largest known Trans-Neptunian object by volume.
  • It is tenth-most-massive known object directly orbiting the Sun.
  • Light from the Sun takes about 5.5 hours to reach Pluto at its average distance (39.4 AU).
  • Pluto has moderately eccentric and inclined orbit during which it ranges from 30 to 49 AU (4.4–7.3 billion km) from the Sun.


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  • It is due to its orbit that Pluto periodically comes closer to the Sun than Neptune, but a stable orbital resonance with Neptune prevents them from colliding.
  • Pluto has five known moons: Charon , Styx, Nix, Kerberos, and Hydra.


Moons Of Pluto. [ Image Source : , ]


Hubble Image Of the Moons of the Pluto. [ Image Source : , ]


Charon (The Moon Of Pluto) by New Horizons on 13 July 2015. [ Image Source : , ]


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  • On July 14, 2015, the New Horizons spacecraft became the first spacecraft to fly by Pluto.
  • During its flyby, New Horizons made detailed measurements and observations of Pluto and its moons.
  • Orbital period of Pluto is 247.94 years.
  • Escape Velocity of Pluto is 1.212 km/s.
  • Recent measurements obtained by New Horizons indicate that Pluto has a diameter of 1,473 miles (2370 km, while Charon has a diameter of 751 miles (1208 km).

Size of Pluto as compared to Earth in picture :


The animated picture shows Pluto and Charon as they would appear if placed slightly above Earth’s surface and viewed from a great distance. [ Image Source : ,]

Pluto’s New Images As Taken By New Horizon :

pluto 1

The images were taken as New Horizons flew past Pluto on July 14, 2015, from a distance of 50,000 miles (80,000 kilometers).             [Image Source : NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute]

pluto 2

This image was taken as New Horizons flew past Pluto on July 14, 2015, from a distance of 50,000 miles (80,000kilometers).                            [ Image Source : Credits: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute ]

pluto 3

This image was taken as New Horizons flew past Pluto on July 14, 2015, from a distance of 50,000 miles (80,000 kilometers).                           [ Image Source : ]

pluto 4

This image was taken as New Horizons flew past Pluto on July 14, 2015, from a distance of 50,000 miles (80,000 kilometers).
[ Image Source : NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute ]
For description of the pictures above please visit This distant planet will be studied more in the upcoming years and the questions which are unanswered will be answered. I have tried to post this article as simple as i can so that readers (especially kids) find it easy to understand and learn. Thank you…..
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An Angel In A Family..

I Am Not A Poet By Profession But Loves To Write Poems Sometimes. Read This Poem And Enjoy.


A Small Little Angel , Asked To Her Father

” How Did You Met , With My Lovely Mother ? “.

” I Met Her At A Clinic ” , Said The Father With A Smile.

” And Looked Each Other For A Little While “.

” Where Was The Clinic ?  ” , Asked The Little One

” It Was At The 18th Street , In The Washington ” .

She Was Very Curious And Questioned Him More

Answered The Questions , To The Angel He Adore .

She Asked ” How Did I Look Like , When I Was Very Small ? ”

Father Thought For An Answer , As She Is Sweet Of All.

Again She Said ” Answer The Question Or I Will Ask Mama ”

Smiled But Paused , Now Father Was In Dilemma.

Again He Thought As He Was In A Whirlpool

Got !! An Answer For The Girl Most Beautiful.

” Best Of Best You Were , And Cute Of All ”

” No One Matched You When You Were Small ”

This Was The Answer Given By The Father

Kissed On Head To His Little Daughter.

There Came The Grandpa , Slowly And Slowly

Kissed The Little Angel As She Was Very Lovely.

Inquisitive Was Her Nature So Questions Didn’t End

Grandpa And Father , Answered Her Now And Then.

Now Came The Grandmother Straight To The Angel

Hugged The Little One And Gave Some Colorful Bangle.

Smiling With Joy She Started More Questions

As Grandmother Too ,  Joined For Suggestions.

Suddenly Came A Loud Voice

Which Made Angel Feel Rejoice.

” Lunch Is Ready ”  Said The Mother

All Sat On Dining Table , With Angel Near Father.

All Started Enjoying , The Delicious Lunch

And Little Baby Added A Sound Of Crunch.

How Can She Quit From Asking The Questions

When Mother Stood Near , For Her Motivation.

Then A Question Came With A Volume Low

Waiting For The Answer , Even Parents Wants To Know.

” Grandpa , How Did You Met My Lovely Grandmother ” ?

This Was The Question Asked By The Little Daughter

” I Met Her In Atlanta Somewhere At The Street Downtown ”

” Your Grandmother That Time , Was Wearing A Beautiful Gown “.

Hearing The Answer Made Happy To Her

Cutely She Said My Questions Are Over.

Happily Stood The Family And Circled Around Her

Together They Said ” Our Daughter Is The Most Beautiful Person In The World ”

Thank you…

Nagesh Patel

This Poem Is Self Composed By Me And Dedicated To All Little Angels In The World.

Light Technically…



We see different things in light. We can perform activities , differentiate between colors , distinguish items and lot more.All these became possible because of light. We cannot imagine how our life would have been without light. Light is really important to us.

Humans , Animals & Plants all need light for survival. It is this light which is the triggering force behind many chemical, biological and physiological changes in life forms on Earth.

But the purpose of this topic ‘Light’ under this post is not only to mention importance of light , but to tell you what is light actually ? , How can we define light ? , What is the study of light called ? ,  What are sources of light ? , What are primary properties of light ? , Is light a particle or wave ? , How does light behaves ? , etc.

We will find numerous theories and articles describing what is light and its form. But , the truth is Light is still a mystery.  When studying Lights , the first question that arises is What is Light ? How can we define light technically ?

Well… we will try to define light in general and technical terms as well . Light has many forms & like light itself, the word can take a lot of different forms — it can be a noun, an adjective, or a verb, and it can mean “bright” or “not heavy”. Before Reading further please note that , when looking in different books , education portals , websites , blogs etc you will find that there are many definitions of Light in general but there actual meaning is the same. So It depends on you (or readers) which one to choose. Similarly when going for technical meaning you will find slight changes in definition of light but again the actual meaning is same.

General Definition Of Light :

Out of many , few selected definitions of Light in general are :

  1. The form of energy that makes it possible to see things or something that makes vision possible.
  2. The natural agent that stimulates sight and makes things visible.
  3. Electromagnetic radiation that can produce a visual sensation.

Light Technically :

  1. In Physics Light is sometimes referred to electromagnetic radiation of any wavelength, whether visible or not. In this sense, gamma rays, X-rays, microwaves and radio waves are also light.                            [Source :]
  2. Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum.                        [Source :]

The word light usually refers to visible light, which is visible to the human eye and is responsible for the sense of sight.

Visible Light :

As the name implies visible light is the light which makes us see things around us. Now you will find similarity in above definitions of light (general definition) and visible light. Do not confuse yourself in the terms light and visible light.

Lets understand clearly ; Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum and visible light is that portion of electromagnetic spectrum which is visible to human eye. This portion is also known as Visible Spectrum.

Visible light are having wavelengths in the range of 400–700 (nm) between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths). This wavelength have a frequency range of roughly 430–750 (THz).

Study Of Light :

Optics is the branch of science which study the behavior and properties of light and its interactions with matter . Or in short Study of light is called Optics.


Sources Of Light :


Everyone knows the primary source of light on earth. Of course our nearest star to us i.e. our Sun. Fire is another important source of light for humans from historical point of view. Human made sources of light are known as artificial source of light. Other sources of light are electric bulb , LED bulbs , candle , battery operated torch , etc.

Primary Properties Of Light  (Visible Light) :

Primary properties of visible light are : Intensity , Propagation Direction , Frequency Or Wavelength Spectrum , Polarisation & Speed ( it is fundamental constants of nature. With value in a vacuum is, 299,792,458 meters per second )

Light Is Particle Or Wave :

Well this is still a unsolved mystery of science. For hundreds of years , people have argued whether light is a wave or a particle. After long study scientists came to conclusion that things are way more confusing than that. Scientists performed studies which seem to show that a photon can act as a wave and a particle at the same time. However , further studies show that a photon can choose itself to be a wave or particle only under controlled conditions. This concept seems simple but scientists have no explanation for this and they are in search for answers . Thus dual nature of light was assumed and given the name ” Wave – Particle Duality”.

Behavior Of Light :

( Assuming light as waves ) Light waves behave in four particularly interesting and useful ways that are :

Reflection , Refraction , Diffraction And Interference.

Importance Of Light To Us :

  • Light is really really important to us. One biggest importance of light is survival of living beings on earth.
  • Humans need light to see and go about daily activities.
  • The invention of fire was man’s attempt to substitute the light of the day while he fights the darkness of the night.
  • Today, technological advancements allow people to exploit other beneficial uses of light such as solar power.
  • The light from the sun is used to power many different devices around the world.
  • The power of light also fuels human spirituality.
  • Light has long been man’s companion during times of meditation and prayer. Light is a means of communication.
  • Beacons, lasers, reflective devices and flashlights of various types prove useful in the conveyance of messages.

In short Light is part of daily life, and it is impossible to live without it.

This post covers few concepts of Light like ; what is light , its source , properties , behavior etc. In the next post under physics section of science category we will discuss other topics related to light.

Enjoy reading..thank you…

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Elecricity Fun Facts…..

Electricity plays an important role in everyday life. Imagine a life without electricity. Read some fun facts about static electricity , circuits , electric eel , volts , amp , etc.


  • Modern society relies heavily on the convenience and versatility of electricity. It powers your microwave, helps light your house, lets you watch TV and so much more.

  • Electric current is measured in amperes (amps).

  • Electric potential energy is measured in volts.

  • Two positive charges repel each other, as do two negative charges. Opposite charges on the other hand attract each other.

  • When an electric charge builds up on the surface of an object it creates static electricity. You have probably experienced static electricity in the form of a small electric shock, which is what happens when the electric charge is quickly neutralized by an opposite charge.

  • Electric eels can produce strong electric shocks of around 500 volts for both self defense and hunting.

  • Electric circuits can contain parts such as switches, transformers, resistors and transformers.

  • A common way to produce electricity is by hydro power, a process that generates electricity by using water to spin turbines attached to generators.

  • The world’s biggest source of energy for producing electricity comes from coal. The burning of coal in furnaces heats boiler water until it becomes steam which then spins turbines attached to generators.

  • Lightning is a discharge of electricity in the atmosphere. Lightning bolts can travel at around 210,000 kph (130,000 mph), while reaching nearly 30,000 °C (54,000 °F) in temperature.

  • Electricity plays a role in the way your heart beats. Muscle cells in the heart are contracted by electricity going through the heart. Electrocardiogram (ECG) machines used in hospitals measure the electricity going through someone’s heart, when the person is healthy it usually shows a line moving across a screen with regular spikes as the heart beats.

  • You may have heard of direct current (DC) and alternating current (AC). The difference between the two is in the way the electrons flow. In DC electrons move in a single direction while in AC they change directions, switching between backwards and forwards. The electricity use in your home is AC while DC comes from sources that include batteries.

  • Back in the 1880’s there was even a ‘war of currents’ between Thomas Edison (who helped invent DC) and Nikola Tesla (who helped invent AC). Both wanted their system to be used with AC eventually winning out due to the fact that it is safer and can be used over longer distances.

  • Electric fields work in a similar way to gravity with an important exception being that while gravity always attracts, electric fields can either attract or repulse.

  • American Benjamin Franklin carried out extensive electricity research in the 18th century, inventing the lightning rod amongst his many discoveries. Lightning rods protect buildings in the event of lightning by conducting lightning strikes through a grounded wire.

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