Question: Is there any other life form i space and if so...are they harmful and would they ever be able to reach earth?

Paul Higgins answered on 18 Nov 2012:

We have no idea if there are other life forms out there, or if they would be dangerous. But it seems likely that there is other life on another planet somewhere, because there are so many other stars and planets orbiting them in the galaxy- and there are so many other galaxies with stars and planets… One thing to think about is that life on earth, like animals, compete and consume each other to survive, so it would be naive to assume that any life on other planets would be friendly to us…