Mercury is the smallest planet in our solar system and is known for its short years, long days, extreme temperatures and weird sunsets.
Giant deposits of ice may not lie hidden under the surface of Mars, between its equator and poles, as recently suggested, a new study finds.
The highest-energy cosmic rays to bombard Earth apparently come from galaxies far, far away, a new study finds.
Learn about the size, shape and composition of asteroids as well as their history, naming conventions, and plans to mine asteroids in the future.
The asteroid belt may have originally started out empty, later becoming a "cosmic refugee camp" taking on leftovers of planetary formation from across the solar system, a new study finds.
A critical feature of many multicellular lifeforms on Earth are hard, biological structures, such as animal bones and snail shells that are made from minerals.
Learn how Earth’s moon formed, how its orbit affects Earth’s tides, why solar and lunar eclipses happen and the history of lunar exploration.
A newly discovered object may be the second-largest black hole in the Milky Way, weighing in at about 100,000 times the mass of the sun.
After decades of hunting, astronomers have tracked down the origin of a nova first recorded by Korean royal astrologers nearly 600 years ago.
A strange dead star may be the surviving remnant of what essentially was a miniature supernova, a new study finds.
"Diamond rain" that may shower through the layers of Neptune and Uranus has been created in a laboratory for the first time, according to a new study.
Mars may experience snowstorms at night, a new study finds, suggesting that the Martian atmosphere is far more active than previously thought.
For the first time, scientists have seen bands of clouds drifting across the skies of failed stars known as brown dwarfs.
An icy world that receives more heat from its parent star may quickly become inhospitable rather than evolving into a locale fit to host life, a new study shows.
A newfound ancient family of asteroids is nearly as old as the solar system, and it could help shed light on how Earth and the other planets formed, a new study finds.
A pair of planet-size objects that failed to become stars makes up the most lightweight binary system discovered yet, a new study finds.
Learn how stars form, how stars and constellations are named, what happens when stars like our sun evolve, and ultimately, die.
The most common asteroids in the solar system may have started out as giant balls of mud, rather than as rocks, as scientists previously thought, a new study finds.
By electrifying tiny drops of fluid, scientists have created miniature versions of the ringed planet Saturn.