Ker Than

The most detailed analysis of light from the atmospheres of two planets outside our solar system ever performed has turned up no evidence of water but possible hints of clouds.

Relatively calm weather was the forecast for the Sun, which is near the minimum of its 11-year solar cycle. But raging solar storms just spotted at its south pole tell a different story.

SPACE.com asks several black hole experts what tops their list of recent black hole discoveries and what they think the biggest questions surrounding these captivating objects are.

Five NASA probes aiming to unravel mysteries surrounding Earth’s colorful auroras are set to launch Friday evening after a 24-hour delay.

The timing of the flow remains uncertain, the researchers say, and could have occurred many millions or even billions of years ago.

A swarm of colliding comets is weaving a dusty death shroud for a distant stellar corpse and providing astronomers with rare proof that certain solar system objects can outlive their suns.

A new cosmic map reveals a close relationship between galaxies that have energetic supermassive black holes at their centers and the distribution of invisible dark matter in the early universe.

Icy particles ejected from a geyser on Saturn's moon Enceladus is blanketing other nearby satellites in reflective dust and ice, making them unusually bright, a new study suggest.

NASA is initiating a review to determine whether changes are required to how astronauts are psychologically analyzed throughout their careers, space agency officials announced Wednesday.

Nighttime clouds detected for the first time on Mars help tos keep the planet�s surface warm after sunset, a new study finds.

A mammoth cloud recently spotted on Saturn�s moon Titan is half the size of the contiguous United States might be what�s filling up lakes discovered there last year.

The last refuge for Martian life, if it exist, might be deep below the planet’s surface—and beyond the reach of any currently planned missions, according to a new study.

Mar's missing atmosphere might be locked up in hidden reservoirs on the planet, and not chafed away by billions of years worth of solar winds as previously thought, a new study suggests.

A recent sky survey has turned up eight new members of our Local Group of galaxies, including a new class of ultra-faint "hobbit" galaxies and what might be the smallest galaxy ever discovered.

SEATTLE - The most distant star cluster astronomers have ever observed has been found behind one of the nearest clusters to Earth.

SEATTLE - Dust shed by a dying star is being siphoned by its healthy companion to build new planets, a new study suggests.

SEATTLE – The discovery of three distant supermassive black holes in close proximity to each other is giving astronomers a glimpse into the chaotic early years of the universe.

SEATTLE - A flurry of lint-like particles discovered swirling around a small, distant star could help explain how miniscule interstellar dust grains clump together to form planets, astronomers say.

The discovery of several large, metal-poor stars located far from the center of the Andromeda galaxy suggests our nearest galactic neighbor might be up to five times larger than previously thought.