The Big Dipper will not keep its familiar shape forever. Learn how stellar proper motion changes its...
See what’s visible before dawn in September 2026, including Mars near Castor and Pollux, bright Jupi...
Learn how to identify Mercury, Venus, Mars, Jupiter and Saturn with the naked eye using their bright...
Polaris has not always been the North Star. Learn how Earth’s axial precession shifts the celestial ...
See what to watch in the night sky this week, Sept. 18–25, 2026, including Venus, Saturn, the Septem...
See what’s visible before dawn in September 2026, including Mars near Castor and Pollux, bright Jupi...
HD 140283, known as the Methuselah Star, is one of the oldest stars ever studied. Learn how astronom...
Learn which constellations dominate the autumn night sky, including Cassiopeia, Pegasus, Andromeda, ...
See what’s in the night sky this week, Sept. 11–18, 2026, including Venus, Saturn, zodiacal light, M...
Discover what the night sky looks like at the North Pole, why Polaris is nearly overhead, how stars ...
Learn how to find the Pleiades (M45), or Seven Sisters, in the night sky, when to see this bright st...
Learn how to find Jupiter in the night sky, identify it among bright stars and planets, and choose t...
