A new study suggests that cosmic radiation could potentially provide the energy to kick-start extraterrestrial life deep beneath the surface of icy worlds like Mars, Europa and Enceladus.

Chandra has been watching the skies since its 1999 launch. It detects X-rays, a type of light invisible to our eyes. These ...

A new model reveals how cosmic electrons and X-rays trigger lightning, solving a decades-old mystery about what starts a lightning strike.