Some of the objects filmed in the last few years make me think this is a subject more people should to be taking seriously. I don't see it happening though.
The NASA tapes show objects which seem to move intelligently, suggesting they are not comets, space fluff or ice crystals. Like this one which banks sharply recorded by NASA STS 114:
Even more unexplainable is the footage the Mexican Air Force released in 2004. They tracked 11 objects with heat sensitive cameras, radar and all sorts of other technical wizardry pokery, and held a press conference announcing that these things were indeed UFOs. The Russians, French and Iranians have all acknowledged they have UFOs in their airspace too. You can see the Mexican UFOs here:
The US response, to some of the most skilled pilots in the Mexican Air Force videotaping these objects out at sea, recorded flying at speed with incredibly sophisticated cameras was, the Mexicans were mistakenly filming 'swamp gas.'
Only in the field of UFO research can people get away with debunking such things as space fluff and swamp gas, without any proof. Because there are so many crackpots making claims about UFOs, really interesting credible evidence doesn't stand a chance of being taken seriously.
If these objects filmed by NASA STS 75 were comets, ice particles or indeed space fluff, we should be worried. Because some of these things, measured against the 12 mile long tether they were filmed passing behind, were approximately 3 miles wide:
http://video.google.com/videoplay?docid=6824781342026209092&q=nasa+ufo+sts+75
As far as I know no one has been able to come up with any explanation as to what these huge pulsing objects were. Probably just swamp gas though. Not to worry.
But by far and away the most interesting thing in this field is the Disclosure Project. I tried to get some discussion going on it here:
http://www.dissensus.com/showthread.php?t=4946
I'll say it again here though. Why would this group of 400 astronauts, ex military, CIA, NASA and Lockheed Martin types say all this stuff apout UFOs and surpressed technology if they didn't believe it? That's the kind of thing that ruins careers. I have no explanation for any of the weird things seen in our skies, an I'm not a huge fan of conspiracy theories and am totally ready to accept a good explanation. But I for one believe these guys at the Disclosure Project believe they are telling the truth.
http://video.google.com/videosearch?q=disclosure+project&so=0