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Topic: livin n non livin , blackhole

1. how could living things created from non living things like stardust?

2. how many theories are there describing creation of this universe?

3. is there any theory that all the galaxies revolve around blackholes?

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Re: livin n non livin , blackhole

(1) Ultraviolet radiations are emitted during star formation or supernova explosion. These ultra violet radiations can generate complex organic molecules from the cosmic dust. These cosmogonically important molecules could have been brought to the earth by comets and asteroids. These molecules might have later played an important role in the evolution of life on Earth.

(2) There are two main theories describing creation of the universe. First theory is known as  'Big Bang' theory in which universe has evolved from 'primordial atom' through a continual expansion. Other theory is known as 'Steady-State' theory. According to this theory, there is neither beginning nor end for our universe. Density of the universe continues to remain same throughout. Available evidence favours the former that is the Big Bang theory.

(3) Many of the galaxies are known to revolve around a supermassive black hole. For example, our own Milky Way Galaxy has a supermassive black hole at the centre. This black hole has a mass which is 4 million times that of our Sun.