SUNSET: 
Is a New Moon News?
Thanks to the latest find by the Cassini spacecraft, we now know that Saturn has 60 satellites circling it.
The End of the Rovers?
The dust clouds on Mars are blocking out so much sunlight that the Mars Exploration Rovers may not survive until the storm blows over.
The Walnut-Shaped Moon
Scientists now think they know why Saturn's moon Iapetus has its distinctive nutty character.
Ice Volcanoes Everywhere?
Pluto's largest moon, Charon, might be the latest solar system body with active geysers on its surface.
A Ringside View of Uranus
Astronomers have assembled an armada of telescopes to observe Uranus in a way that hasn't been possible since the 1960s.
Martian Dustup Has an Impact
As a storm rages in Mars's atmosphere, two rovers on the surface and three orbiters above wait for the dust to settle.
Dawn's Liftoff Delayed to September
When delays narrowed the spacecraft's July launch window to just a few days, NASA managers decide to wait two months.
Mars Pole Bound — Again
NASA is set to launch its latest Mars mission, the Phoenix lander, as early as August 3rd.
Let's Hope Dawn Doesn't Break!
When NASA's Dawn spacecraft leaves Earth behind on Sunday, it'll begin an 8-year asteroid-hopping adventure.
Return of the Sponge Moon
Back in 2005 we reported why Hyperion had a sponge-like appearance. Turns out that our old story is dead wrong!
What a Difference a Decade Makes
It's been a decade since Mars Pathfinder touched the surface of Mars and heralded a new era of Martian exploration.
Ceres: The Wet Look
Mounting evidence suggests that the largest asteroid is hiding a large cache of water ice beneath its surface.
Is there another planet besides Earth whose moon(s) would fit perfectly over the Sun?
It is amazing when you think about the coincidence of the Sun being 400 times bigger than our Moon, yet 400 times farther away, producing an almost perfect fit for a total solar eclipse. Is there another planet whose moon(s) would fit perfectly over the Sun, or are we just…
What was the cloud spotted near the western horizon August 31, 2004?
Around 9 p.m. on August 31, 2004, I saw a bright patch of light about half the size of the Moon near the western horizon. It moved slowly upward and fluctuated somewhat in brightness. Through an 8-inch Schmidt-Cassegrain telescope here in New Bloomfield, Pennsylvania, there were two points of light…
Call for Observations: Saturn's Moons
Advanced amateurs with CCD-equipped telescopes are encouraged to measure the "opposition effect" — a brightening expected to occur in the Saturnian system during this upcoming opposition (January 13–14).
A New Comet Machholz
Found lurking among the dim stars of the constellation Eridanus, Don Machholz's 10th cometary find will brighten steadily in the months ahead.
A Comet's Brush with the Sun
The SOHO spacecraft watched as a comet swung past the Sun.
Moon Study Tracks Changes in Earth's Cloud Cover
Scientists are looking to the Moon to learn about Earth's climate change.
Cassini Calls on Phoebe
Cassini's first rendezvous with a Saturnian moon was a date to remember.
