A mysterious cigar-shaped object spotted tumbling through our solar system last year may have been an alien spacecraft sent to investigate Earth, astronomers from Harvard University have suggested.

Anytime anything even remotely unusual happens in space, you can bet that there will be people who say that it must be aliens. Usually, these are regular people who happen to enjoy alien conspiracies, ...

'As the number of exoplanets we've discovered increases, the question about life existing somewhere other than the Earth ...