Today I read that NASA capsule carrying comet dust is en route to Earth.
I have been wondering about this issue of "contamination" for a long time... even since I read Michael Chrichton's The Andromeda Strain. Some people have even suggested that SARS came from space.
Talking about space... let me bring your attention to Celestia or (SourceForge Project Page)
The free space simulation that lets you explore our universe in three dimensions... travel throughout the solar system, to any of over 100,000 stars, or even beyond the galaxy.
Amazing. This brings a whole new meaning to Star Trek's motto -- "To boldly go where go man has gone before."
The screenshots I have seen are also brilliant.