Aliens visited earth but where to small to see
"Before I came I had grave doubts as to whether the red rain was really an indication of life coming from space; new life coming from space," he said. "But on reflection and after talking to Godfrey, I think I would now fairly firmly believe that it did represent an invasion of microbes from space."BBC NEWS | Science/Nature | Searching for 'our alien origins'
Organisms from space! Isn't that good enough as alien life? But still no big news reports?
http://arxiv.org/PS_cache/astro-ph/pdf/0601/0601022.pdf
http://www.geocities.com/iamgoddard/Sampath2001.pdf
The scientists agree on two points, though. The things look like cells, at least superficially. And no one is sure what they are.Skepticism greets claim of possible alien microbes