Have you watched the video? It was witnessed by more than one person and they did get video footage.
And that footage is where?
Just because he was an astronaut, doesn't make him any more credible than any other eye-witness account or anecdote. Astronauts are capable of the same cognitive errors or making stuff up just as much as the next guy.
This "saucer" description that caught on after the Kenneth Arnold sightings is curious. He only ever said they seemed to skim the sky like saucers, not shaped like them.
It does make him more credible actually. When you have such a high profile person as himself making these claims, it makes it less likely that he is going to make that stuff up because they have a lot to loose
The video's could have been classified as top secret or something, who knows where they are
I bet if I gave an example of some Joe Bloggs encounter with a UFO you would be going on about his credibility
Let me make this clear I'm not trying to get into a debate about if aliens exist or not, I'm only trying to give some good examples of UFO's, (Unidendified Flying Object's). Not aliens ;)
Here is another one - http://www.youtube.com/watch?v=bfLfgSgG6cE
Typical skeptics, have an excuse for everything :)
If you think all of these stories are either made up, illusions or miss-interpreting things, why do you think it is so common?