And by aliens I mean, outer space creatures and UFO. For whatever reason all UFO sighting footage looks either fake or like recorded with a Casio keyboard. And I find hard to believe we don’t have any decent footage of them with all the surveillance and technology we have now.
Edit: 🍿
Ah, but “major technological breakthroughs” != “major technological breakthroughs concerning faster-than-light travel”. Certainly, there will be more of the former in the next 300 years, but our understanding of physics precludes the latter.
The quality of our understanding of physics is proved by the technological advances that we’ve already made with it. Yes, we’re missing some major pieces, like how to unify general relativity and quantum mechanics (how to quantize gravity), but the problem that physicists face on this front is actually how stunningly well the Standard Model holds up, and has so far resisted attempts to break it. It’s highly unlikely that we’ll discover anything which completely upends the laws of physics as we know them.