SUNSET: 
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…
The Future of SETI
Searches for extraterrestrial intelligence are about to expand into new realms, thanks to new advances in technology — and new thinking.
Saturn's Spare Tire
Over the last year, NASA's Cassini spacecraft has repeatedly spotted a debris pocket bulging out of one of Saturn's rings.
Watch This (Sun) Spot
Sunspots change their shape and size as they travel across the face of the Sun. Catch an evolving sunspot group caught in the act.
Mercury in the Morning
Amateurs are observing this elusive planet more successfully than ever before; try spotting it yourself.
Watch the Re-Entry of Stardust
Late Saturday night, January 14-15, skywatchers in much of the American West can watch for a dazzling artificial "meteor."
Predicting Solar Eruptions
As NASA looks to return astronauts to the Moon and send them beyond to Mars, the health hazards posed by solar explosions are a serious concern.
Earth's Coldest Star Party
One of the most inhospitable places on Earth might also be one of the best places to do astronomy.
Long-Lived SOHO Celebrates A Milestone
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Astro Image in the News: Spitzer Spies Monoceros Nebulosities
The Spitzer Space Telescope has produced a magnificent mosaic of the Christmas Tree Cluster.
Long-Lived SOHO Celebrates a Milestone
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Mars News, True and False
It's unkillable! A two-year old e-mail chain letter is misleading people into expecting Mars to go nuts in August.
~Black Hole Mass Measurement
Even though it is nearly 100-million light-years distant in the constellation Ursa Major, this Seyfert type galaxy named NGC 3516 has been observed to have a super-massive black hole lurking within it estimated to be over 10-million times the mass of the Sun.HST/ UCLA/ M. Malkan The IMAGE_1 tag will…
New Light on Dark Energy
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Giant Telescopes of the Future
Telescopes as large as 20, 30, and even 100 meters are now on the drawing boards.
New Amateur Asteroid Awards
Congress has established $2,000 annual prizes for U.S. amateurs who discover near-Earth asteroids or aid asteroid research.
Binary Quasar Is No Illusion
A close pair of quasars in Pisces turns out just that, not the record-breaking gravitational lens that astronomers had hoped.
Asteroid Flyby Caught!
On July 3, 2006, an 800-meter (half-mile) asteroid called 2004 XP14 flew past Earth at a distance a little greater than that of the Moon.
Black Hole Booted from Galaxy
A black hole now zipping through Ursa Major might have been dropkicked out of the galactic disk by an asymmetrical supernova.
Hubble's Back — and Better Than Ever?
The Hubble Space Telescope's main camera is back online, almost two weeks after a problem with its power supply forced it into safe mode.
