If life exists on moons orbiting Saturn and Jupiter, instruments headed there in the fall may just need a tiny ice grain to find it.

Sound waves thought to be from a 2014 meteor fireball were almost certainly vibrations from a truck rumbling along a nearby road.

New research explores the links between atmospheric oxygen and detecting alien technology on distant planets.

The Milky Way likely has hundreds of millions of planets that are promising targets to probe for signs of life outside our solar system.

Regions on exoplanets called "terminator zones" could be prime sites for liquid water and possibly harbor life, a new study shows.

"...Hansel and Gretel dropped breadcrumbs to make sure they'd find their way back. In our scenario, the 'breadcrumbs' are miniaturized sensors..."

A future mission to Enceladus, one of Saturn's 83 moons, could discover its potential for harboring alien life—all without ever landing.

Newly discovered microbes may give scientists a blueprint for the kinds of potential life forms that could exist on Mars.

Planets may form differently around binary stars than they do near loners like our Sun. The finding could lead to new targets in the search for alien life.

Oxygen in an ocean on Jupiter's moon Europa may be similar to oxygen in Earth's oceans. "Our research puts this process into the realm of the possible."