A hoax 'alien invasion' alert in Brazil caused panic and amusement, revealing vulnerabilities in emergency systems.

A NASA astronaut preparing for a grueling eight-month stint in orbit reveals a plan to test for extraterrestrial life.

Scarlett Dargan imagines this week's generational debate ...

An interstellar comet that passed through the Solar System last year may be up to 12 billion years old – far older than the ...

A new exoplanet model screens rocky worlds by their ability to retain atmospheres over geologic timescales, helping narrow ...

God and aliens are having a moment. But what do Christianity and other faiths really teach about ETs?

Could Martian mudstones be holding evidence of ancient microbes? New findings strengthen the case that the Red Planet once ...