SUNSET: 
The Heart of Omega Centauri
Left: Some 50,000 stars are individually resolved in a Hubble Space Telescope view through the center of the globular cluster Omega Centauri. Click on the image for a low-resolution view, or here for a full-resolution view. Right: The Hubble frame is only 13 light-years wide, but the entire cluster sprawls…
Smoking Gun for Milky Way's Black Hole
Astronomers find conclusive evidence for a black hole in the center of the Milky Way
SuperWASP Scrutinizes Swarms of Stars
In a hunt for extrasolar planets, hundreds of thousands of the brightest stars are getting measured precisely many times per night.
Astro Image in the News:
No Moon for Sedna
Images from the Hubble Space Telescope reveal that Sedna is solitary and smaller than initially indicated.
Redshift Record Smashed Again
Astronomers have used a gravitational lens to view a baby galaxy 96.5 percent of the way back to the Big Bang.
New Light on Dark Energy
By measuring distances to the farthest Type Ia supernovae yet, astronomers and getting a sense of how dark energy works.
Black Hole Rips Star Apart
A supermassive black hole in a distant galaxy has shredded a star that ventured too close.
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.
