I've done quite a bit research in this.
ETs: My opinion is that they have to exist. No way that just this one tiny planet next to millions and millions of more planets can support life. The thing I don't know is if these aliens as we call them are able to travel through space and if UFOs are made by them of by us.
Roswell: Never done so much research in this one. Not too interested. Something had to happen. It definitely was an UFO to us normal ppl. But was it an vehicle used by ETs or a secret military aircraft?
And my fav; Groom lake (aka Area 51)
Again almost impossible to tell if they are experimenting on ET technology in there. But I doubt it. All evidence I have seen is that they are testing new hi-tech military aircraft in there. (for example the Aurora, which totally kicks ass
Evidence there is;
Does any normal plane need that HUUUUGE runway on Area 51?
Doughnut-on-a rope effect. The weird trail that ppl see in the sky. Most likely it has been done by a new type of engine, a one that doesn't burn the fuel, but makes it explode. This technology ofcourse leading to hyper sonic speeds, which the Aurora (if there is one) is most likely capable of.
The video & pictures, seen many pictures and 1 video of this so called Aurora. Kinda looks like a mix of B2 stealt bomber and the F-117A nighthawk.
It's black, triange shaped, but the tail is different from the two planes I mentioned earlier. And, from what I saw on the video, damn that thing is fast.
If there is not a new spyplane that is operational then why on earth did the US airforce take their best & fastest recon aircraft SR-71 blackbird out of service?
There was an mention of Aurora in the pentagons defence budget one year, ofcourse the moment they spotted their mistake it was blacked out.
Those are just part of the evidence there is.
Ofcourse all of this is just speculation, most of the info I have collected from the internet, some I just wrote from the top of my head.