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Astronomy Essentials
Tonight
Visible planets and night sky guide for December
Visible planets and night sky guide. Tonight, look for the waning gibbous moon near the bright planet Jupiter and Gemini's twin stars Castor and Pollux.
December 6, 2025
Astronomy Essentials
Today's Image
The last full supermoon of 2025. Best pics here!
The full Cold Moon on December 4 was the last supermoon of 2025. See a gallery of photos of the last full supermoon from the EarthSky community here.
December 5, 2025
Human World
Will we digitize human bodies for healthcare?
What would it be like if we could digitize human bodies? We could recognize heart attacks as they happen and deliver tailored doses of medicine to the sick.
December 5, 2025
Today's Image
See the best deep-sky photos of November 2025 here
Enjoy this gallery of deep-sky photos for November 2025 from our EarthSky community. If you have a great photo to share, send it in, too. We love to see them!
December 5, 2025
Space
What time is it on Mars? The 1st precise answer
What time is it on Mars? The time difference between Mars and Earth is a complicated puzzle. But it's necessary to solve for future explorations.
December 5, 2025
Earth
Human World
Audubon Christmas Bird Count signup has begun
The Audubon Christmas Bird Count, held each winter, is one of the longest-running community science projects. You can help collect important data about birds.
December 5, 2025
Human World
December birthstone: turquoise, zircon or tanzanite
The December birthstone is 1 of 3 gemstones, the exquisite blue-green turquoise, dazzling zircon, or the magnificent blue-violet tanzanite. Your choice!
December 5, 2025
Tonight
Andromeda galaxy: Find it by star-hopping from Pegasus
The 4 stars of the Great Square of Pegasus are easy to find. Ready? Let's star-hop! Use these guide stars to help find the Andromeda galaxy.
December 5, 2025
Space
Proximity to a supermassive black hole doesn’t spell doom
Scientists found that stars in the "S-cluster," a group of young, high-velocity stars orbiting our galaxy's central supermassive black hole, have stable orbits.
December 4, 2025
Space
Today's Image
Mercury’s sodium tail is now appearing in special filters
On December 3, 2025, Steven Bellavia imaged Mercury's sodium tail flowing away from the sun. See the image here and read more about Mercury's tail.
December 4, 2025
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