Early on September 29, Ganymede is crossing Jupiter’s disk as Io approaches the planet from the west;...
Astronomy.com
Pieces of the Murchison Meteorite fell to Earth on Sept. 28, 1969, with a series of loud...
Looking for a sky event this week? Check out our full Sky This Week column. September 27: Catch Saturn’s...
Britain's first professor of radio astronomy, Martin Ryle was also known for his vocal opposition of nuclear...
Four of Saturn’s moons should be easily visible the night of the 27th. Titan especially will start...
The false-color image captured by Cassini during the Sept. 26, 2005, flyby highlights Hyperion's intensely porous surface....
Looking for a sky event this week? Check out our full Sky This Week column. September 25: Neptune at...
For those in the Northern Hemisphere, the autumnal equinox marks the start of fall. This year, the...
A 1735 copperplate engraving published after Ole Roemer's death shows him at work in his home observatory...
Looking for a sky event this week? Check out our full Sky This Week column. September 24: Blue Neptune,...
Friday, September 25Mercury passes 1.0° north of Spica at 9 P.M. EDT. You can find more details...
McGetchin Crater's dark, 728-foot-wide (222 m) pit sits inside a bright halo of ejecta, with streaks of...
Luna 16 featured a 35-inch-long extendable arm with a drill on the end, for sample collection. Credit:...
Bluish Neptune sits close to the golden-colored star HIP 968 on the night of September 24. In...
RS Puppis is a Cepheid variable star whose brightness varies by a factor of five roughly every...
One of the Whirlpool Galaxy’s spiral arms resolves into dozens of stellar nurseries that one day will...