Galaxy
> Agalaxy is a vast system of billions of stars, which also contains a large number of gas clouds (mainly of hydrogen gas) and dust, isolated in space from similar systems.
> There are about 100 billion galaxies (1011 galaxies) in the universe, and each galaxy has, on an average, 100 billion stars (1011 stars). So, the total number of stars in the universe is 1022 stars.
> The Milky Way Galaxy is the home of the Earth and our Solar System. It is spiral in shape.
> Milky Way Galaxy was formed 5 billion years after the Big Bang.
> Latest known galaxy is the Dwarf Galaxy.
> According to the modern thought, universe can be classified into two parts namely-(a) Atmosphere and (b) Space.
> Origin of the universe is explained by the Big Bang Theory, formulated and proposed by the Belgian astronomer and cosmologist Georges Lemaitre.
> Andromeda is our nearest galaxy.
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