The Essential Guide to Astronomy
Sky & Telescope senior editor Alan MacRobert has been covering all aspects of astronomy since 1982.
Astronomy & Observing News
They're not open clusters and they're not globulars; astronomers have found a third kind of star cluster inhabiting some galaxies.
By: Alan MacRobert
July 23, 2003
By carefully watching the brightnesses of 52,000 stars, astronomers have found 43 that have small, dark objects periodically crossing their faces.
After successfully settling into orbit around the Red Planet, NASA's Mars Odyssey has begin its 2½-year mapping mission.
A spiral galaxy's arms trail behind when it rotates, right? Not always.
The cosmic chess piece, the Horsehead Nebula, is seen in all its glory through the eyes of the VLT.
Celestial Objects to Observe
The lunar surface consists of more than just craters and mare. Here's a guide to some of the other lunar features.