We don’t know. There are lots of theories. Our universe could be one of many (the collection of which is called the multiverse). The laws of physics that we know might only apply to our universe.. the more we learn about our own universe the better equipped we’ll be for learning about others
We dont know… we can only speculate based on scientific understandings. But the laws of our universe will probably not apply there. So we just dont have the tools to work out the answer to this question.
The physicists would know far better than me! I don’t think we will ever know – everything we know about everything is based on our universe, so we might never be able to find out what’s outside it. But sometimes it’s nice to know that there will always be a few mysteries out there.
We’re not really sure. The universe is SO big, we can’t easily send some astronauts out there to have a look! (Although that would be super fun – it would take forever – literally!)
But people who study things like astrophysics are investigating this. From what I understand, our universe is constantly expanding…so it must be going out into something, we’re just not exactly sure what!