Sure. Here are some quick responses to some things that have been brought up in the thread.
First question: are aliens visiting the Earth? No chance in heck. There's no serious evidence, and there's no conspiracy to cover up the evidence.
Next question: are there UFOs? Absolutely. There are lots of flying objects that are not easily identified. But that doesn't make them alien transport vehicles.
Are aliens out there in the galaxy? Maybe, maybe not. I've heard at least one serious scientific talk on the Drake equation,
https://en.wikipedia.org/wiki/Drake_equation, and the upshot is that as the Wikipedia article points out, depending on how you estimate things there could be anywhere from 1 intelligent life civilization in the galaxy (i.e., us) to tens of millions of civilizations. My own opinion is that there's an excellent chance that we're alone in the galaxy. But that's just an opinion, undoubtedly influenced by my religious beliefs (discussion for another time), and I could well be wrong.
Next question: if there are aliens out there, will we be able to visit them? Not anytime soon. As someone pointed out, we're limited to travel at speeds slower than the speed of light. And the galaxy is made up of
HUGE distances. Right now we can't even send a manned vehicle to Mars (0.000006 light years away) even though NASA has been working on that very, very seriously for the past 10 years. Among other things, there is a serious health threat from radiation. I'm certain that will be solved, but I'm nearly certain we still won't have the technology to mount a manned mission to even the closest habitable planet* within my lifetime (I'm 43). And just because the planet
could be habitable doesn't mean that it has intelligent life. An unmanned mission to a possible habitable planet might well be in the cards before too long, but a manned mission to a planet that contains intelligent life? Not for hundreds and hundreds of years in my opinion... and that's assuming we even find such alien intelligent life in the galaxy (which is by no means certain, as I mentioned in the previous paragraph).
Next question: what about faster-than-light travel like wormholes or teleportation? No chance in heck of having anything like that remotely usable as a transportation mechanism, within my lifetime. And maybe not ever. The elephant in the room that is nearly always glossed over when science fiction writers utilize FTL travel, is that if FTL can ever be achieved, causality ceases to exist. That is, if something can be sent faster than the speed of light, then in some reference frames, the object arrives before it leaves. And that can be used to make effects precede causes, with real paradoxes therefore becoming possible. See
https://en.wikipedia.org/wiki/Causality_(physics). Since I believe in causality, or at least I think it's VERY VERY likely that causality is a fundamental law of the universe, I personally don't think that FTL travel will ever exist. But even if it does, there's no chance it'll be usable in my lifetime.
* looks like the closest possibilities are 4-12 light years away:
https://en.wikipedia.org/wiki/List_of_nearest_terrestrial_exoplanet_candidates