An anomalous “cloud” imaged by amateurs in 2012 has puzzled astronomers, spurring some to suggest it was at inexplicably high altitudes above Mars’s surface.
A red dwarf and its brown dwarf companion buzzed through the outer Oort Cloud some 70,000 years ago, around the time when modern humans began migrating from Africa into Eurasia.
Scientists studying ice here on Earth think they’ve confirmed why comets have hard crusts covered in hydrocarbon gunk.
This image series, taken by NASA’s New Horizons spacecraft in late January 2015, reveals the dwarf planet Pluto and its largest moon, Charon, orbiting their common center of mass.
The magnetic fields in the asteroid parent bodies of two pallasite meteorites lasted hundreds of millions of years after our solar system’s formation.
Once the Rosetta spacecraft arrived at Comet 67P/Churyumov-Gerasimenko last August, European scientists used an array of instruments to assess every nook and cranny of the remarkable two-lobed nucleus.
With a small telescope and our sky charts, you can watch the sizable near-Earth asteroid 2004 BL86 race among the stars on the night of January 26–27.
Where, exactly, did our oceans come from? New research suggests that asteroids might have both delivered and removed lots of water — and that Earth itself might have locked it away deep inside.
NASA’s NuSTAR mission recently returned a striking image that shows the Sun’s active regions crackling with X-rays.
Samples taken from two drill holes on Mars support the idea that Mars lost a whole lot of water fairly early in its history.
A highly successful spacecraft has ended its mission after returning nearly a decade of data on Earth's nearest planetary neighbor.
The International Astronomical Union is hosting a public contest to name five of Mercury's craters, with a deadline of January 15.
The exact location of Philae’s landing site remains unknown, though the site’s topography might allow the lander to operate longer than planned. Meanwhile, Rosetta is detecting organics and heavy elements even when Comet Churyumov-Gerasimenko is far from the Sun.
NASA’s Curiosity rover has detected both methane in Mars’s atmosphere and carbon-bearing organic compounds in its rocks. But it’s unclear where these molecules come from — or whether there’s any biological connection.
NASA’s MAVEN mission has discovered a new population of particles in Mars’s upper atmosphere. It’s also found a plume of particles escaping from the planet’s poles, confirming atmospheric loss is happening today.
An early outcome from Rosetta's scrutiny of Comet 67P/Churyumov-Gerasimenko is that the isotopes in its water have distinctly different ratios than those on Earth.
NASA's Dawn spacecraft spent 14 months photographing Vesta from close range. Now geologists have completed a global map of the asteroid's surface geology.
Right on cue, New Horizons spacecraft has awakened from its final electronic hibernation. Seven months from now, it will make the first-ever visit to Pluto.
Japan's second asteroid-sample mission launched successfully on December 3rd after weather delays. If successful it will reach asteroid 1999 JU3 in 2018, explore for 18 months, and then return to Earth with souvenirs.
A newly processed image from NASA’s Galileo spacecraft shows Europa’s breathtaking beauty and tortured surface in greater detail than ever before.
Amateur astronomers have confirmed the presence of a large, bright storm cloud on the ice giant Uranus.
Scientists think they've figured out what causes the mysterious ruddy coloring in the giant planet's enormous oval storm.
With its battery power failing, Philae became the "little lander than could" and managed to return results from all 10 of its science instruments before slipping into hibernation.
After free-falling toward Comet 67P/Churyumov-Gerasimenko for seven hours, ESA's Philae lander bounced on the surface twice before finally coming to rest.
A fresh look at a nagging problem — asteroids moving in comet-like orbits — concludes that asteroids must make up about 4% of the vast, distant Oort Cloud of comets. When a telescope atop Hawaii's Haleakala swept up a fast-moving object in August 1996, astronomers didn't know what to make of it. Designated 1996...