SUNSET: 
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.
A New Neighbor Star
Astronomers turn up a faint red dwarf just a few light-years from the solar system.
Views of the Pale Blue Dot
NASA's Mars Global Surveyor has become the latest spacecraft to image the Earth-Moon pair from afar.
The Deepest Photo Ever Taken
The Hubble telescope's newest and best camera has broken the record for imaging the faintest stars and galaxies.
Titan's Surface: Mostly Ice, Not Goo
Saturn's large, haze-shrouded moon is covered mostly with dirty ice rather than exotic hydrocarbons, according to the best spectral evidence yet.
Astro Image in the News:
A Spectacular Light Echo
An erupting star in Monoceros spreads its light across surrounding gas and dust.
How Bright Was History's Brightest Supernova?
The dazzling supernova of the year 1006 amazed the medieval world. Now astronomers have pinned down its distance and brightness.
