Astronomy

Stars! Black Holes! Galaxies! Planetary Nebulae! SO.MUCH.AWESOME. From NASA, of course.

From NASA Ames Research Center.

Ad-driven commercial site, with links to interesting information for amateurs and professionals alike.

...needs no introduction.

Lots of really good, reliable information from the American Museum of Natural History's Hayden Planetarium.

London's answer to NASA.

NASA's Wallops Island Launch Site on Virginia's gorgeous Eastern Shore, if you're up for a road trip! (You can also watch launches live via their broadcast, too.)

"The AAVSO is an international non-profit organization of variable star observers whose mission is to enable anyone, anywhere, to participate in scientific discovery through variable star astronomy."

"This website pays tribute to Neil Armstrong's professional life, including his time as a test pilot, his monumental first steps on the moon, and his subsequent life as a professor at the University of Cincinnati (UC). --J. Roach (formerly of U of Kansas) Choice

Current director of the Hayden Planetarium and Astrophysicist.