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Centaur 2nd-stage rocket

Solar System

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…

Celestial News & Events

Call for Observations: Saturn's Moons

Advanced amateurs with CCD-equipped telescopes are encouraged to measure the "opposition effect" — a brightening expected to occur in the Saturnian system during this upcoming opposition (January 13–14).

Solar System

A New Comet Machholz

Found lurking among the dim stars of the constellation Eridanus, Don Machholz's 10th cometary find will brighten steadily in the months ahead.

Solar System

A Comet's Brush with the Sun

The SOHO spacecraft watched as a comet swung past the Sun.

Solar System

Moon Study Tracks Changes in Earth's Cloud Cover

Scientists are looking to the Moon to learn about Earth's climate change.

Solar System

Cassini Calls on Phoebe

Cassini's first rendezvous with a Saturnian moon was a date to remember.

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