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On this day in space! Dec. 23, 1672: Giovanni Cassini discovers Saturn's moon Rhea
On Dec. 23, 1672, Italian astronomer Giovanni Cassini discovered Rhea, Saturn's second-largest moon.
How 2025 became the year of comet: The rise of interstellar 3I/ATLAS, an icy Lemmon and a cosmic SWAN
Highlights from a cometary trio that captured our imaginations.
Artemis 2 moon rocket gets 'America 250' paint job | Space photo of the day for Dec. 23, 2025
The "America 250" logo commemorates the upcoming 250th anniversary of the signing of the Declaration of Independence.
Doomed SpaceX Starlink satellite photographed from orbit
We just got a great up-close look at a SpaceX Starlink satellite that recently suffered an anomaly in orbit, thanks to Vantor's WorldView-3 spacecraft.
Best targets to observe between Christmas and New Year 2025
From a crescent moon and a 'Christmas Star' to deep sky delights, the wonders of the holiday night sky are yours to explore.
Northern lights may be visible in 10 states tonight
Auroras may be visible from Alaska to Idaho as incoming speedy solar wind continues to buffet Earth's magnetic field.
Night sky tonight Dec. 23: Don't miss the delicate crescent moon tonight
Find out what you can see in the night sky for tonight, from planets and stars to dazzling meteor showers.
Aurora forecast for Dec. 23 - Northern lights possible tonight amid lingering space weather
The latest aurora forecast for tonight help you make sure you're in the right place at the right time to see the northern lights.
