Earth is dotted with humongous, human-made structures that, to an alien eye, may be tell-tale signs of intelligent goings-on.

To date, over 5000 exoplanets have been discovered using telescopes on the ground and in space. Credit: NASA/JPL-Caltech ...

From a boardroom in outer space.

A new study suggests that the comet that rambled past us from another star last year likely originated in a cold, isolated ...