On the frozen surface of Jupiter’s moon Europa, a strange, star-shaped scar has become an unlikely focal point in the search ...

A cosmologist suggests we should look for exploration, along with energy signatures, to try and find aliens. Dyson spheres of some kind may be built to harvest energy from dark matter in black holes.

What would be the best way for an advanced alien civilisation to make its presence known across the galaxy? It might be to make the planets in its star system dance in mathematical sequence. Many ...