Question

If solar system is in a galaxy and a galaxy is in the universe, what is the universe inside? What's there outside the universe?

Answer 1

It’s believed that this universe is a small part of space but technology is not. So developed to go far out thus it remains a myth
For some are in black hole for some we lie in universe as a small space of ours

Answer 2

Universe usually refers to the collection of all matter in space so there's no further classification after universe and there must be empty space outside the universe however there may be a few theories stating that universe is infinite and there may be a few further classifications like multi verse.