Ancient aliens theory, I think its disinformation, part of a script like another poster pointed out. Just like I think the terrorism threat is largely fabricated. Werhner von Braun said on his deathbed that first we'd use the russians, then terrorism, and finally aliens. That doesnt mean I dont believe in other life whether thats interstellar or interdimensional, but I do think a vast majority of the ufo phenominon is human. Drifting toward the op point, Im not sure that telecope has to be all that big. We can look at Mars and possibly find signs of whatever was there before it was nuked. NASA has known since the 70's Viking Mission than xenon 129 exists in the martian atmosphere. Thats not a natural phenominon. Somebody nuked Mars from space 250-500 million years ago...and this comes from somebody that worked on that mission, an expert in the weapons field.