SUNSET: 
Saturn Surprises Right Up Until Cassini's End
Saturn keeps its secrets as NASA's Cassini spacecraft heads towards its September grand finale.
Source of Mars Trojans Might Be Mars Itself
A new study proposes a possible source for the mysterious Mars Trojan asteroids: the Red Planet itself.
Is Our Sun Slowing Down in Its Middle Age?
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.
Amateur Observers Find an Asteroid's Moon
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.
By Jove! Juno Images Jupiter's Great Red Spot
NASA's Juno Spacecraft delivers stunning closeup views of Jupiter's famous swirling Great Red Spot storm.
NASA Eyes "Ice Giant" Missions in the 2030s
A recent NASA study outlines possible dedicated missions to the "ice giant" planets Uranus and Neptune that might leave Earth as early as 2030.
New Wrinkles in the Search for “Planet X”
Are astronomers being misled about a possible ninth planet by the quirky alignment of orbits that they’re finding in the distant Kuiper Belt?
Rosetta Finds Clues to Earth's “Xenon Paradox”
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.
Observers Track New Horizons' Next Target
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 to Touch the Sun
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.
Two New Satellites for Jupiter
Just a mile across, a pair of moonlets found orbiting Jupiter bring the planet's total satellite count to 69.
New Impact Flash Seen on Jupiter
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.
Juno: Surprises in First Science Results
From its dynamic atmosphere to its hidden depths, the Juno spacecraft has Jupiter as never before — surprising NASA scientists with unexpected complexity.
How Hard Did It Rain on Ancient Mars?
Mars was once far wetter than it is now — but just how much rain fell, and when?
Water Flow Gives Insights on Mars and Titan
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.
Amazing New Views of Near-Earth Asteroid
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: From Gravitational Waves to Space Dust
LISA Pathfinder, the technology testbed mission for a future gravitational-wave detector, turns out to be a surprisingly good micrometeoroid hunter.
Enceladus: Hydrothermal Heating Confirmed
Astronomers have more evidence that the hidden ocean inside Saturn’s moon Enceladus is heated by hydrothermal activity.
See a Potentially Hazardous Asteroid From Your Backyard
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…
Sun Triggers Ceres’ Fleeting Atmosphere
Planetary scientists think the Sun may inadvertently create a transitory, tenuous atmosphere around the dwarf planet Ceres — and in an unexpected way.
