Question

what is outside universe?

Answer 1

Nobody ecactly knows what is outside the universe. Some scientists say that outside the universe there is nothing but darkness, and others say that there are other universe as well that were made by big bang.

Answer 2

✳️ the universe is full of stars. but go more than about 100,000 light years away, and u have left the Milky way behind that, there's a sea of galaxies : perhaps two trillion in total contained in our observable universe.

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I hope it's help you.