Extraterrestrial civilisations could give themselves away by the night-time glow of their cities. And if there is one lurking in the outer reaches of our solar system, we are ready to find it.

Perhaps Arthur Brown, the 78-year-old man from Hermitage, Pennsylvania, with lights and foil on his house to prevent aliens from invading, is a bit extreme in his measures. His neighbors sure think so ...

Did NASA discover city lights on an alien planet? This video explores the implications and details of the findings that suggest the presence of artificial light sources on a distant exoplanet. The ...

An unusual long line of illuminous lights caught the attention of people across the UK ...