SUNSET: 
Odds of Mars Strike Now 1-in-25
Astronomers have been watching a small asteroid that, they now say, has a 4% chance of colliding with Mars on January 30th.
Friday Movie (and Sing-along)
A rock ballad from the 1970s now has a cosmic twist.
Eclipses in 2008
Don't miss February's total lunar eclipse (the last one anywhere until late 2010) — and look ahead to a total solar eclipse in exotic settings in August.
Mars in the Crosshairs?
Astronomers are waiting to see what becomes of a skyscraper-size asteroid that has a 1-in-75 chance of hitting Mars in late January.
It's Official: 2009 Is the Year of Astronomy
The United Nations' General Assembly has formally proclaimed 2009 the International Year of Astronomy.
Tunguska's Blast: Less is More
Aided by high-def supercomputer simulations, two researchers now argue that small asteroids striking Earth — like what happened over Siberia in 1908 — may pose greater danger than previously believed.
David Levy's Binary Asteroid
An otherwise run-of-the-mill, main-belt asteroid named 3673 Levy just got a lot more interesting: It has a tiny moon!
Meteor Showers in 2008
With minimal moonlight to interfere, the best meteor showers of 2008 should be the Quadrantids, the Aquarids, and the Perseids.
Sky Highlights of 2008
Eclipses, occultations, conjunctions, and meteor showers — there's no shortage of celestial action in 2008.
A Gamma-Ray Burst Out of Nowhere
Astronomers are mystified by a gamma-ray burst without a host galaxy.
Fred Hess: Evangelist for Astronomy
How do amateur astronomers get made? Countless numbers of them were started on their way by this booming-voiced figure from New York's Hayden Planetarium.
New Astro Radio and Podcasts
Improve your mind with some science-related audio.
Deep Impact's New Assignments
Put to sleep after its smash success in 2005, one of NASA's interplanetary craft is getting a chance to search for extrasolar Earths and to visit a second comet.
Earth's Magnetosphere: On the Ropes
A constellation of five identical orbiting probes has detected skirmishes with the solar wind along Earth's magnetospheric front lines.
You Can't Go Home (or Work) Again
Visiting where I worked 20 years ago reveals a changed place.
Thirty Meter Telescope Moves Ahead
Thanks to a just-announced commitment of $300 million, astronomers and engineers can get ready to build the Thirty Meter Telescope — far larger than any other telescope on Earth.
The Other Bright Comet of 2007-08
Comet 8P/Tuttle is now near its peak. Although nowhere near Comet Holmes in total brightness, its light is concentrated in a much smaller area, making it considerably more prominent when viewed from typical suburban locations.
200 Million Objects Shining in Hydrogen
A new sky survey is seeing the universe in a new way.
Dust in a Hot Jupiter's Atmosphere
Precise measures by Hubble indicate that a roasting "hot Jupiter" close to its star has an atmosphere thick with dust.
