Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. This article is more than 5 years old. "Lithopanspermia" ...

The notion of panspermia â?? the transferral of viable organisms between planets, and even between star systems, seems to be getting a bit more attention these days. One only has to open this previous ...

We often wonder whether there are aliens on other planets but what if we ourselves are aliens on the planet we call home? Panspermia, the “controversial” theory that life “began elsewhere in space” ...

Scientists have long debated the possibility of that the microbial seeds of life did not originate on Earth, but were perhaps delivered here from an alien source, encased in comets or meteorites from ...

GREEN bulging eyes, three heads and putrid breath? Nobody knows what life on Mars may have been like, if it existed at all, but scientists are determined to find out. Last month, the European Space ...

The grandfather paradox is an example of a problem arising from the effect of time travel on causality, the idea that a cause must precede its effect. The paradox suggests that a cause is eliminated ...