Question

what is universe. Explain why there is no air in universe
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Answer 1

Universe is a whole of space and all the Stars , planets and other forms of matter of energy in it.

Answer 2

Explanation:

The Universe contains billions of groups of stars known as galaxies . It is believed that the Universe began with very hot , dense explosion called the Big Bang , which took place between 10 and 20 billion years ago. As the Universe expanded, it cooled down and then galaxies , stars and planets we're formed. Our Galaxy , the Milky way , is near the outer edge of a huge supercluster of galaxies. There is no air in the Universe because it doesn't sustain because of some substances.