Question

how should we know that what is the universe ?
and
what is the star which is running hear and there in sky ?

Answer 1

Answer:

1.All existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light years in diameter and contains a vast number of galaxies; it has been expanding since its creation in the Big Bang about 13 billion years ago.

2.All the stars move into he sky here and there.....

Hope this helps you