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Wednesday, January 24, 2018

What is Space?

What is Space?


     Space is a zone or place extended over millions of kilometers above our earth's surface. It consists of millions of stars, planets, asteroids, comets, meteors, suns, galaxies and many solar system. In technical term, space is a vaccum. i.e sound cannot travel. It also have dark matters and dark energies that occupies 70 percent part of the universe. It also have black holes, supernova, binary stars, pulsars and giant gas nebulae.

Can life is possible in Space?

    Yes, life is possible. As per modern discoveries life is possible only in earth.Because it lies in the habitable zone and minimal distance from sun, so that it can maintain moderate temperature for life forms. But scientists predict that life can be possible in space beyond earth. Because the vast universe have multiple number of solar system and some planet may lie in the habitable zone like our earth.

Difficulties to live in space:

     Space is a blank area where we cannot breathe as there is no air and atmosphere. we cannot live in those blank space, because the pressure is very low as compared to the pressure of blood inside our body which results in burst of body and death. It does not have sufficient platform to stand and move our body parts, so we won't be stable in one place. we keep on moving towards any direction into the cosmos. It doesn't have plants to provide sufficient oxygen for individual human to breathe and there is no water to drink. One of the major problems is the exposure to radiation. Cosmic radiation comes from deep space can cause health problems like cancer and may leads to death.Similarly, there are many challenges for human beings to survive.

How universe is formed?


     The answer for "how the space and universe is formed?" is a still a hypothesis (unproven or may be proved in future) and a very difficult question to be explained by the scientists. The science of astronomy and astrophysics born in around 4th century at the time of Greek period. To answer this question, hundreds of scientists and astronomers are working day and night for proposing a model to explain the birth of universe. Finally in early 1927, one of the famous Belgian scientist of 20th century Georges Lemaitre first proposed an "expanding model of the universe" by which he formulated Hubble Law. Later, it became a key for the "Big Bang Theory" developed by Friedmann, Lemaitre, Robertson and Walker. 

What is Big-Bang Theory?

Big-Bang Theory model
     Big-Bang is a giant explosion of energetic particles and dark matter due to the action of gravity, which resulted in the formation of universe. The explosion include nuclear fusion and nuclear fission. Due to huge explosions matters started to expand and spread over the universe, these particles get collided  and combined to form stars, galaxies, solar systems and planets. Some of the small parts from the explosive became asteroids and comets. The formation took billions of years and the current age of the universe is about 4.6 billion years. Major contribution to this big-bang theory was made by American scientist "Stephen Hawking".

Black Holes:

Black Holes
     Black holes is otherwise called worm hole, which are formed by the collapsing of stars white dwarf. It have high gravitational field inside from which nothing can be escaped including light which travels at 300,000 km/sec. It is a mystery that what is inside the black hole? Research works are going on by several observatories around the world

Gravitational Waves:

Gravitational Waves
   Gravitational waves are ripples in space fabric. It was predicted by Albert Einstein in the last century but it was finally detected in 2017. It was detected by LIGO Observatory in Livingston. LIGO stands for Laser Interferometer Gravitational Observatory. The waves was discovered by three noble laureate's (Kip.S.Thorne et al, 2017). It was detected three times over two years in 2015 and 2016. Research papers were published about the discovery and detection of gravitational waves.

Planets and Moon:

Our Solar System
     Planets like Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and the dwarf Pluto were formed from the Sun. They were a part of burning sun. After few billion years, they started to cool shaping to a beautiful planet. The moons which are moving around every planets also formed from part of every planet. They process of geo-dynamic cooling prevailed for billion years. It made a change in the planetary surface of earth for the birth and origin of life.


      Asteroids are nothing but the minor planets existing inside our solar system. The larger asteroids was called planetoids. They never grew to large one to become a planet. The are millions of asteroids revolving around the sun. They are densely gathered in a region called asteroid belt, which lie between planet Mars and Jupiter. Sometimes many small asteroids were used to fall on the surface of Earth and Mars, Jupiter was used to impacted by many asteroids from the asteroid belt.The first ever asteroid discovered was Ceres.


   Comets are icy bodies coming from outer solar system. They are mostly made up of icy gases and used to come to our solar system after a certain cycle of time. They tend to melt and release gases when they pass close to our sun due to the action of heat. It melts completely and finally disappears. They are very popular and rare object in the sky to observe during life time. Some of the near earth comets were Encke's comet, Halley comet etc.. In our lifetime we can able to see both the comets mentioned earlier. We can see Encke comet in June 2020 and Halley's comet in July 2061 as expected by the astronomers.


Imaginative Image of Earth and Asteroids
    Our space and universe is a beautiful creation ever made. Our knowledge about the universe is just 10% and still there are many things to know. Exploring and expanding the knowledge about the universe is a human nature. we will be having wonderful and mysterious discoveries in the future. Space is, that cannot be imagined simply in our brain.

Image Credit : NASA
Text Credit: Team Spacexpress
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