we know that space is vacuum then how did the stares, sun and the other heavenly bodies form?

Asked by shweta mondal | 22nd Jun, 2013, 01:54: PM

Expert Answer:

The space is now a vacuum but initially, when the planets and solar system were still forming, it was not a vacuum. It is believed that billions of years ago, it was a hot ball of gases. Though this has not been absolutely proved, but this is most widely accepted and explained through big bang theory. 
The Big Bang theory is the prevailing cosmological model that describes the early development of the Universe.According to the theory, the Big Bang occurred approximately 13.798 ± 0.037 billion years ago,which is thus considered the age of the universe. After this time, the Universe was in an extremely hot and dense state and began expanding rapidly. After the initial expansion, the Universe cooled sufficiently to allow energy to be converted into various subatomic particles, including protonsneutrons, and electrons. Though simple atomic nuclei could have formed quickly, thousands of years were needed before the appearance of the first electrically neutral atoms. The first element produced was hydrogen, along with traces of helium and lithium. Giant clouds of these primordial elements later coalesced through gravity to form stars andgalaxies, and the heavier elements were synthesized either within stars or during supernovae.

Answered by  | 23rd Jun, 2013, 08:41: AM

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