I've read that some American researchers have claimed to have found the "end of the universe", ie proof that it exists. What do people here think? The first thing I come up with is, what's beyond that? And isn't the universe meant to be infinite?

But if you accept the Big Bang theory, ie that the universe had a start, then you have to concede that it must also have a finish. It's possible that they've reached the boundaries of what we define as the universe.