The Sun has been unusually quiet lately. Since the start of 2017, only a single tiny sunspot has made a brief appearance on the solar disk.
Astronomers have combined data from the Voyager spacecraft and the Hubble Space Telescope to probe the stuff between the stars.
From the discovery of gravitational waves to the building evidence that a massive planet could exist beyond Pluto, it has been a thrilling year for astronomy research. We recap.
This beautifully detailed 6-inch globe lets you explore the amazing geology revealed by New Horizons during its historic 2015 flyby.
New results from NASA's Dawn orbiter show that the largest asteroid (and acknowledged dwarf planet) must possess a global layer of water ice that lies just below its dark, dusty surface.
Curiosity scientists have tracked Gale Crater’s changing environment as it became more, then less, acidic over millions of years. Microbial life could have survived in these conditions.
Welcome to Mars: the European Space Agency's ExoMars Trace Gas Orbiter sets up shop around the Red Planet.
NASA's Cassini spacecraft delivers stunning views from its new orbital perch.
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.