This UFO stuff is all a bunch of crap. Any species intelligent enough to have interstellar travel will also be able to avoid being seen by our relatively primative technology.
Perhaps
"Aliens have made contact says Apollo astronaut Edgar Mitchell"
Article from: The Daily Telegraph
July 24, 2008 11:30am
FORMER NASA astronaut and moon-walker Dr Edgar Mitchell - a veteran of the Apollo 14 mission - has stunningly claimed aliens do exist.
And he says extra-terrestrials have visited Earth on several occasions - but the alien contact has been repeatedly covered up by governments for six decades......"
What a stinking pile of silly assumptions.