Friday, April 4, 2014

Universe Will Contract After Expansion.

In the whole universe, everywhere we see two types of processes. Either expansion or contraction. Let we first take example of living organisms. They first grow up (expand) then rotten (contract). If you see a rotten fruit using speed photography, it contracts and emits gases and other elements (expansion). Sometime rotten and putrid things bloat (expand) instead of contracting; and many living things become smaller as they grow. Insect Larvae are a prime example. 

At macro level, stars after its birth expand. Once the hydrogen fuel at the core is exhausted, a star of at least 0.4 times the mass of the Sun expands to become a red giant. This is the process of expansion and then sometime ends on black holes; a process of contraction, though most stars in the universe end up as white dwarves which ultimately become brown dwarves. All these are the examples of expansion – contraction.

Stars that begin with more than 50 solar masses can lose over half their total mass while they remain on the main sequence. This is process of contraction in term of mass.

Stars of at least 0.4 solar masses exhaust their supply of hydrogen at their core, their outer layers expand and cool to form a red giant. It is expansion in terms of volume.

In a red giant of up to 2.25 solar masses, hydrogen fusion proceeds in a shell-layer surrounding the core. Eventually the core is compressed enough to start helium fusion, and the star now gradually shrinks in radius and increases its surface temperature, which is a process of contraction.

In this way we can form an hypothesis that our universe will contract after the current process of expansion. And then again it will be converted into a small point as it was in beginning before the big bang. 

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