Take part in this year's Great World Wide Star Count, and you'll be joining thousands of other "citizen scientists" in raising dark-sky awareness around the globe.
"Light echoes" off dust clouds far from an old supernova are still providing replays of the explosion as seen from different directions. They show that the explosion was asymmetric.
For anyone in a 25-mile-wide path right across Los Angeles, a bright star in Ophiuchus will wink off for several seconds in the predawn hours of April 6, 2010.
California's comet-hunting veteran Don Machholz bagged his 11th discovery on March 23 and 26, 2010. It's a faint diffuse comet, low in the morning sky.
Japanese amateur Koichi Itagaki, of recent comet fame, has just discovered a nova near Rigel on November 25, 2009.
On November 7, 2008, 14-year-old Caroline Moore of Warwick, New York, discovered a supernova in the galaxy UGC 12682, making her the youngest person ever to find an exploding star.
On March 26, 2009, Korean amateur Dae-am Yi caught the small, greenish glow of a new comet with his Canon camera.
On the morning of Friday, Jan. 9, from 10:55 to 11:06 UT, asteroid 1963 Bezovec occults the 8.3-magnitude star HIP 64220 in a narrow path from Baja California through Texas to New England and Nova Scotia.
During January 2009 a faint star in Cepheus will fade, as it does every five or six years, when "something" goes in front of it.
Late Monday night, October 6-7, 2008, a tiny asteroid will enter Earth's atmosphere over Sudan, creating a spectacular explosion in the night sky.
An unexpected meteor burst was detected on the night of September 8-9. Bill Cooke of the Marshall Space Flight Center is urging meteor watchers to see if the activity continues on the night of September 9-10.
Amateurs have helped lead the way in recording the flashes of meteoroids hitting the Moon's night side.
Jupiter's newest red spot was disrupted during its encounter with the Great Red Spot and Oval BA, but appears to be reforming.
During May and June 2008, this visitor may be dimly visible without a telescope — but only if you live in the Southern Hemisphere.
Just magnitude 9 when discovered on April 18, 2008, this nova in Sagittarius has brightened tenfold.
Two Japanese amateurs captured the new star on April 10, 2008, at a spot where their camera had recorded nothing just three days earlier.
On March 8, 2008, this asteroid or one of its two moons could make a faint naked-eye star vanish briefly from the sky.
How bad is the light pollution where you live? How many stars can you see on a dark night? Last year the GLOBE at Night project tallied 8,500 star-counting estimates from around the world. That's great but we can do better! All it'll take is 30 minutes and a clear evening between now and…
A huge, remote asteroid could briefly blot out a faint star in Gemini on February 10-11, 2008.
As the first images are released from Messenger's flyby of the innermost planet, previous ground-based observations are proving to be surprisingly accurate.
On Nov. 14, 2007, a star in the constellation Puppis suddenly became visible in binoculars.
On Wednesday, October 24, 2007, this faint comet between the orbits of Mars and Jupiter suddenly became a naked-eye "star."
Using modest gear and a lot of skill, amateur astronomers catch a record-breaking planet crossing the face of its star 250 light-years away.
New calculations indicate that Charon may actually occult an 8.7-magnitude star on Sept. 27, 2007.
Pluto will pass extremely close to an 8.7-magnitude star on September 27, 2007; observers should monitor the star's brightness electronically.