If confirmed as a galaxy, a newly identified star system would be the faintest ever discovered—and could suggest there are others that remain to be found.

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.

A new study offers important insights into the evolution of the moon's interior, and potentially for planets such as the Earth or Mars.

Now out in space for more than two years, the James Webb Space Telescope is a stunningly sophisticated instrument.

A type of eclipse is crucial for measuring what’s in the atmospheres of planets orbiting distant stars.

The Starfish Prime test in 1962 showed how dangerous it would be to detonate a nuclear weapon in space.

An instrument on the Europa Clipper mission might be able to detect biological cells from space.

"While eclipses are a marvel to behold, they're also a window into the workings of our solar system and beyond..."

The Solar System could be awash with oceans, not on the surface but hidden inside the most surprising bodies

"...there are strong, twisted, and organized magnetic fields near the black hole at the center of the Milky Way galaxy."