A challenging and intensive campaign by telescope-toting teams yields big-time results on the body that the New Horizons spacecraft will fly past in 17 months.
Solar astronomers may have finally detected gravity waves in our star’s core, revealing that the Sun’s central region rotates about four times faster than the outer layers.
Saturn keeps its secrets as NASA's Cassini spacecraft heads towards its September grand finale.
A new study proposes a possible source for the mysterious Mars Trojan asteroids: the Red Planet itself.
The Sun, now halfway through its life, might be slowing its magnetic activity, which could lead to permanent changes in the sunspots and auroras we see.
A team of amateurs observers, some armed with just 3-inch telescopes, have found that the main-belt asteroid 113 Amalthea probably has a small companion.
NASA's Juno Spacecraft delivers stunning closeup views of Jupiter's famous swirling Great Red Spot storm.
A recent NASA study outlines possible dedicated missions to the "ice giant" planets Uranus and Neptune that might leave Earth as early as 2030.
Are astronomers being misled about a possible ninth planet by the quirky alignment of orbits that they’re finding in the distant Kuiper Belt?
Xenon measured by the European Space Agency's Rosetta spacecraft has shed light on a long-standing mystery about the role comets played in Earth's formation.
On June 3rd, two dozen teams of observers in South America and South Africa tried to learn something about distant 2014 MU69, which New Horizons will visit in early 2019.
NASA's Parker Solar Probe, set to launch in 2018, will be humanity's first effort to "touch the Sun," revolutionizing our understanding of the Sun's corona, the solar wind, and the greater heliosphere.
Just a mile across, a pair of moonlets found orbiting Jupiter bring the planet's total satellite count to 69.
Flash! A comet or asteroid fragment whacked Jupiter on May 26th. It's the sixth time that observers on Earth have witnessed an impact on the giant planet.
From its dynamic atmosphere to its hidden depths, the Juno spacecraft has Jupiter as never before — surprising NASA scientists with unexpected complexity.
Mars was once far wetter than it is now — but just how much rain fell, and when?
A team of researchers led by Benjamin Black (City College of New York) used global drainage patterns of Titan, Earth, and Mars' surfaces to determine the likelihood of recent tectonic activity.
Large asteroid 2014 JO25 cruised past Earth on April 19, and Goldstone and Arecibo radars were at the ready to capture what turned out to be yet another twin-lobed asteroid.
LISA Pathfinder, the technology testbed mission for a future gravitational-wave detector, turns out to be a surprisingly good micrometeoroid hunter.
Astronomers have more evidence that the hidden ocean inside Saturn’s moon Enceladus is heated by hydrothermal activity.
Get ready for 2014 JO25, the biggest asteroid to fly this close to Earth since 2004. Good news — even a 3-inch telescope will show it! Update: See below for a radar image and animation of 2014 JO25 captured by NASA's Goldstone Solar System Radar on April 18, 2017. Every week, a handful of new Earth-approaching asteroids…
Planetary scientists think the Sun may inadvertently create a transitory, tenuous atmosphere around the dwarf planet Ceres — and in an unexpected way.
NASA's Cassini mission nears its final act — the spacecraft will enter the first of its Grand Finale Orbits later this month.
NASA’s MAVEN mission has confirmed that the solar wind stripped the Red Planet of its atmosphere.
Data from the Rosetta mission has linked outbursts on Comet 67P/Churyumov-Gerasimenko with dramatic changes on the comet's surface.