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Did a lost moon of Mars create tides in an ancient lake?
Thin, repeating sedimentary layers examined by the Curiosity rover suggest that a big, lost moon of Mars created tides in the ancient lake of Gale crater.
December 10, 2025
Lightning on Mars? Electric sparks in dust devils confirmed
NASA's Perseverance rover has detected lightning on Mars 55 times. It heard the small electrical discharges with its microphone in dust storms and dust devils.
December 9, 2025
Where’s the normal matter in our universe?
Planets and stars in the night sky are made of normal matter. Yet only 9% of the universe's normal matter is in objects such as these. Where is the rest of it?
December 7, 2025
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
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
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
Did we just see dark matter? Scientists express skepticism
A bold new study claims to have made the 1st ever direct detection of dark matter, but scientists are expressing skepticism.
December 3, 2025
EarthSky’s lunar calendar: How to use this great gift!
Follow the moon! Here’s why you need an EarthSky lunar calendar, the top tips for using it and where you can order one.
December 3, 2025
Does a supermoon have a super effect on us?
The extra pull of gravity from a supermoon creates higher-than-usual tides. But the effects of a supermoon on a human body are imperceptible.
December 1, 2025
Tally of near-Earth asteroids passes 40,000
Astronomers announced in November 2025 they've now discovered over 40,000 near-Earth asteroids. What risks do these pose to Earth?
November 27, 2025
