Planetary scientists have pinpointed the size of a near-Earth asteroid to be a mere 2 meters, one of the smallest ever characterized.
Cassini's final main engine burn this weekend sets up the first act of a grand finale.
Astronomers are debating the existence of a big planet beyond the orbits of Pluto and Neptune. Dr. Michelle Thaller talks with planetary scientists Scott Shepard and Mike Brown about when we'll discover it.
Dug out of a Texas field last year, the second-largest chondrite ever found in the U.S. has been donated to Texas Christian University.
A big, nitrogen-ice-filled basin has apparently caused Pluto's entire crust to shift over time.
NASA's intrepid Mars rover gets a close-up view of a bizarrely shaped space rock that landed on the lower slope of Mount Sharp.
Thanks to two aggressive search programs, the count of near-Earth asteroids has soared past the 15,000-object milestone. (None of them are likely to hit us.)
The gas giant is emerging in the glow of dawn sporting an tumultuous North Temperate Belt.
A pair of high-resolution images taken from high above Mars appears to show the impact site of ESA's Schiaparelli lander.
Hubble images reveal a satellite orbiting one of the Kuiper Belt's biggest objects.
Here's what we know so far about the fate European Space Agency's Schiaparelli mission.
After a 7-month journey from Earth and a 139-minute rocket burn, the ExoMars Trace Gas Orbiter has settled in around its new home.
Engineers have decided to keep the Jupiter probe, Juno, in its current orbit until an issue with its engine can be addressed.
NASA’s youngest Mars orbiter has watched clouds grow and detected an ozone accumulation on the Red Planet.
Planetary scientists haven't yet witnessed an active volcano on Venus, but a new study pinpoints a likely set of still-warm lava flows.
As Schiaparelli prepares to land on Mars, how are the other robotic denizens of the Red Planet doing?
The innovative joint European Space Agency/Roscosmos Schiaparelli lander begins its three day solo journey to the Martian surface this weekend.
Observations from NASA’s Lunar Reconnaissance Orbiter reveal that the Moon is being pockmarked by meteoroids at a higher rate that previously predicted.
Right now 2014 UZ244 lies nearly 14 billion kilometers away, ranking it third among the most distant objects known in the Kuiper Belt.
A new analysis suggests that a subsurface ocean might lie deep beneath the crust of Saturn’s moon Dione.
Newly released Hubble images show what appear to be towering jets of water coming from Jupiter's moon Europa.
The historic mission to explore a comet ends in dramatic fashion on September 30th.
A new e-digest from the International Astronomical Union’s Minor Planet Center gives the public a head’s up on passing asteroids.
Back in January, a team of observers had a hunch that Comet 332P/Ikeya-Murakami was rapidly falling apart — and they were right!
A team in Argentina unearths a spectacular space rock, possibly the world's third largest single find.