A research team has developed a new approach to detecting life beyond Earth that does not rely on identifying specific ...

Trump has ordered a UFO data release. But if aliens exist, what would they think of us? - For generations, human beings have ...

(cokada/iStock/Getty Images) Alien megastructures built to harvest stellar energy or alter the orbits of stars may be ...

Comet 41P/Tuttle-Giacobini-Kresak has begun acting a little unusually, but there are likely natural explanations before we go ...

Could ancient humans really have built the pyramids without extraterrestrial help? Or do such questions reveal more about modern anxieties than the past itself? The idea that aliens assisted the ...

In these science fiction books, extraterrestrial beings are sympathetic, horrifying and everything in between.