Recent observations suggest that scientists have identified potential microbial fingerprints in the atmospheres of other planets, raising intriguing questions about the possibility of alien life ...

When astronomers observe distant exoplanets, they sometimes encounter a frustrating result: instead of revealing the chemical fingerprints of an atmosphere, the data appear almost completely flat.

Learn about the theories behind the unusual dimming of Tabby's Star, from alien megastructures to an orbiting companion ...

These noctilucent clouds, reflecting light from the sun after sunset, have been visible in Martian skies for the past four fall seasons. Credit: NASA / JPL-Caltech / MSSS A rover got a new view of ...

A photograph captured over Canmore, Alberta, on 2 August by Chary Woods appears to show a saucer-shaped cloud formation, sparking intense debate about whether it resembles a UFO. The image shows an ...