SUNSET: 
Prepare to Be Blown Away by Iapetus
Cassini finally encounters Saturn's wacky moon Iapetus today. Don't wait for the processed pics to be released. Check out the raw images now!
The Source of the Dinosaurs' Asteroid
Did a colossal collision in the asteroid belt 160 million years ago doom the dinosaurs? A just-published analysis argues strongly for exactly that.
The Sun Shakes the Earth
A team of scientists makes a compelling case that sound waves rattling around inside the Sun are literally shaking Earth's interior.
The Sun's Hot Corona: Mystery Deepens
Why is the Sun's atmosphere so hot? Physicists thought they knew the answer — powerful waves of energy moving up from the solar surface — but now they're not so sure.
Mars Rovers Rolling Again!
Predictions that the twin Martian explorers wouldn't survive the dust storm thankfully proved to be wrong. Spirit and Opportunity are back in business.
Rings of Uranus on Edge
For the first time since the rings of Uranus were discovered, astronomers are studying their edge-on view.
Icy Shower Poses No Threat for Cassini
Scientists are confident that the towering ice geysers on Saturn's moon Enceladus shouldn't harm the Cassini spacecraft during a close flyby next March.
Voyager 2's Lucky Day
Thirty years ago, on August 20, 1977, Voyager 2 left Earth and began its conquest of the outer solar system. Had it not been for the luck of the draw, this historic mission would have turned out very differently.
One Less "Possibility of Life"?
Just because Saturn's moon Enceladus has active geysers doesn't mean it harbors alien life. That's the take-home message from an upcoming scientific paper.
Risky Business
Two American collectors manage — barely — to get in and out of Colombia with fragments from a fresh meteorite fall.
Do Sunspots Cycles Forecast the Rain?
A team of researchers claim that sunspot activity might accurately forecast rain in Africa.
Do Sunspots Forecast the Rain?
A team of researchers claim that sunspot activity might accurately forecast rain in Africa.
Phoenix Heads to Mars
Rising from the ashes of a mission to Mars that disappeared without a trace in 1999, the Phoenix spacecraft is on its way to the Red Planet.
Understanding Saturn's G Ring
Astronomers might have found the source for Saturn's mysterious G ring.
Comet Discoverers Awarded
This year's Edgar Wilson Award went to three unique amateur comet discoverers.
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.