Question

What is big bang theory .Explain​

Answer 1

The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now—and it is still stretching!

Answer 2

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The most widely accepted theory about the origin of universe is Big Bang theory. Astronomers found out that the universe is expanding, i.e., the separation between galaxies is becoming larger and larger. This led them to deduce that everything used to be extremely close together. According to this theory, all the matter in the universe was initially concentrated into a vast mass about 100 million light years wide. About 15 billion years ago, this super-dense mass exploded (hence the name, Big Bang). As a result, matter flew in all directions through space, leading to the formation of the galaxies.

$\huge\dag\sf\red{By \: Divyanshu}$