Sorry but Dan is a bit delusional. Given the laws of physics and the immense distances involved it is simply not possible for an alien mechanical or biological entity to visit Earth or us them. However given the fact that we have been transmitting in analog for over one hundred years and in logarithmic digital for nearly forty, there is a chance an advanced civilization has heard us and return messages are on the way.
Not even with wormholes?
“Given the laws of physics and the immense distances involved it is simply not possible for an alien mechanical or biological entity to visit Earth or us them.”
Obviously you never heard the phrase, “warp speed, Mr. Sulu”
;-)
The “laws of physics” as we currently know it are woefully incomplete. While I am fully cognisant of the vast distances that separate the stars. (play around withe “celestia” program for a while and you’ll get a feel of it.) There is no way that I could say that anything is impossible. There is still much in the universe that we do not now understand. Heck, we still can’t say whether or not gravity is an actual force or if it is just something that arises from the nature of space itself. Personally, I think we are only scratching the surface of what can ultimately be known.
MUFON may well be way off base, but I think there is much going on in the world that we are not privy to.