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

Aliens aren’t “out there” – they’re here on Earth. You may have seen one. You may even be one. And if you read the foregoing ...

We have no idea what kind of life may exist on other planets, so it’s hard to know what to look for. Proxima Kósmos imagines ...