SUNSET: 
Opportunity Lands, Spirit Revives
This 360° panorama was assembled from some of the first images beamed to Earth from NASA's Opportunity rover after it landed at Meridiani Planum on Mars.Courtesy NASA/JPL. NASA got a double dose of good news from Mars last night. The Opportunity rover landed successfully on Meridiani Planum and began sending…
The Most Massive Star
A luminous blue variable star located some 45,000 light-years away could be the most massive and perhaps the most luminous star ever discovered.
More Galaxies that Jump the Gun
Astronomers have found a distant string of galaxies that took shape earlier than current cosmology can explain.
The Sun's Closest Twins
Astronomers hope to learn much from our Sun's doppelgangers.
Explaining Supernova Explosions
Astronomers are one step closer to understanding how white dwarfs blow themselves up.
Old Galaxies in the Young Universe
A survey of galaxies has found that not all star systems in the early universe were small.
Auroras Light Up the Sky
Many skywatchers who kept an aurora vigil during the morning hours of October 29, 2003, were richly rewarded by a spectacular display.
Solar Flare Spawns More Aurora
For the second time in two nights, an explosion on the Sun triggered a widespread display of the northern lights, this time during the evening of October 30, 2003.
Mars: The Show Continues
Mars will remain a fiery yellow-orange beacon in the evening sky during the first half of September and will shrink and fade only a little until well into October.
Solar Flare Again Spawns an Aurora
For the second time in the last few days, a powerful flare on the Sun triggered an unusual display of the aurora borealis over some of the world's midlatitudes.
Meeting the Solar System's Final Frontier
This artist's concept shows structures in the tenuous gas where the expanding solar wind meets the interstellar medium far beyond Pluto. Voyager 1 has apparently crossed the first boundary layer, as described in the text. Voyager 2 still has a way to go.Courtesy NASA / Walt Feimer. NASA's farthest-ranging spacecraft…
Black Hole "Sound" Heats a Galaxy Cluster
Bubbling blobs send powerful, super-deep sound waves rippling through a galaxy cluster's hot gas.
Mars's Dazzling Sky Show
Late in August the planet Mars passes closer to Earth than it has been in nearly 60,000 years — and the red planet has become a fiery yellow-orange beacon in the evening sky.
Scrutinizing Supernovae
Astronomers uncover new clues about what happens in the crucial Type Ia variety of exploding star.
The Oldest, Weirdest Planet
It orbits not just one star, but two. And it's almost as old as the universe itself.
Keck Interferometer Measures a Future Solar System
In a technological tour de force, the two giant Keck telescopes combine light waves for super-sharp resolution of the disk around a young star.
Arizona Scopes Escape Wildfire
Intense firefighting efforts have saved the many telescopes of Steward Observatory northeast of Tucson.
NASA To Launch Glowing Night Clouds
NASA will release three luminous clouds into the night sky over the Eastern Seaboard as early as tonight.
Delta Scorpii Still Showing Off
For the fourth summer in a row, a special star near Antares is shining abnormally bright.
News from the Sun
Solar astronomers meeting this week have announced a spate of new research results about our home star.
