SUNSET: 
Eris and Pluto: Does Size Matter?
It's been nearly a year since the dwarf planet Eris passed directly in front of a star and, in doing so, gave observers the measurements they needed to deduce its diameter. It turns out that Eris and Pluto are almost exactly the same size — and yet different in many ways.
Taking the Temperature of Ancient Mars
The famous (and infamous) Martian meteorite called ALH 84001 has revealed that the Red Planet had a warmer and wetter past — at least here and there on its surface.
Is Mercury Alive After All?
The Messenger spacecraft has discovered unusual hollow formations on Mercury's surface. No one knows what causes them, but volatile-spewing volcanoes are candidates.
Comet Water for a Parched Earth
Recent observations of comet Hartley 2 shed light on one of the oldest mysteries: where did Earth's water come from?
First Science Results from Dawn
Closer observations shed light on the history of Vesta's cratered surface, its mineral composition, and its inner iron core.
Mercury Shows Its True Colors
After six months of studying the innermost planet with NASA's Messenger spacecraft, planetary scientists are discovering unexpected surface compositions and are finally zeroing in on how the innermost planet came to be.
WISE's Survey of Near-Earth Asteroids
A heat-sensing NASA spacecraft finds that there aren't nearly as many large and midsize asteroids hovering near Earth as astronomers thought. Now we can all sleep a little easier.
One Image, Five Moons
A quintet of Saturn's moons come together in the Cassini orbiter's field of view for a group portrait.
GRAIL Heads for the Moon
By this time next year, the twin spacecraft of NASA's Gravity Recovery and Interior Laboratory mission should have given geophysicists an unprecedented peek at the lunar interior from crust to core.
Kenya's Rain of Meteorites
On the morning on July 16th, villagers heard a thunderous explosion in the sky and later found space rocks scattered throughout their corn fields.
The Moon's Uncertain Age
Is the lunar crust only 4.36 billion years old, as new results suggest, or at least 4.43 billion years old, as most researchers believe? The difference isn't much — but the implications for early lunar history are profound.
Opportunity Reaches Its New Home
The surviving one of NASA's two Mars Exploration Rovers is reaching the brink of a whole new adventure on Mars.
Juno Lifts Off for Jupiter
NASA's solar-powered spacecraft Juno successfully lifted off Cape Canaveral on Friday, August 5th.
Big Splat Could Have Reshaped the Moon
Recent research suggests that the thick, heavily cratered crust on the Moon's far side could be the pasted-on remains of a second satellite that once orbited the early Earth.
Best Evidence Yet for Martian Water
NASA's Mars Reconnaissance Orbiter has found perplexing dark streaks that form seasonally and strongly suggest that liquid water flows on the Martian surface.
Where No Spacecraft Has Gone Before
Dawn sends stunning images from Vesta of an uncharted alien world.
Earth's Traveling Companion
Astronomers have identified a small body sharing Earth's orbit in a gravitationally stable resonance that keeps it from hitting us or escaping. Finally, Earth has a Trojan asteroid to call its own.
Hubble Spots New Moon Orbiting Pluto
Astronomers using the Hubble Space Telescope have discovered a new moon orbiting the icy planet Pluto.
A Closer Peek at Vesta
This week, Earth was hit by a barrage of intriguing images of Vesta — all courtesy of Dawn, NASA's latest asteroid orbiter!
Does Air Pollution Alter Lunar Eclipses?
Observations of June 15th’s total lunar eclipse suggest that smoggy skies over China created unusual patterns in the umbral glow on the Moon.
