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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
New fairy lantern plant discovered at popular Malaysian park
Scientists have discovered an exquisite new species of fairy lantern - called Thismia selangorensis - at a park near Kuala Lumpur, Malaysia.
December 10, 2025
Schedar shines brightly at the Queen’s heart
Schedar is the brightest star in the distinctive W-shaped northern constellation Cassiopeia and is visible most of the year from northern latitudes.
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
Thinking of buying a telescope? Read these tips 1st
Are you thinking of buying a telescope? Here's how to know if you're ready, with tips on what 1st-time buyers should look for.
December 9, 2025
Why humpback whales are coming back
Humpback whales are making a remarkable comeback, thriving in new habitats thanks to conservation efforts and their adaptable feeding habits.
December 8, 2025
Your earliest sunset comes before the winter solstice
The solstice comes on December 21, 2025, at 15:03 UTC. Does that coincide with your earliest sunset? Probably not. It depends on where you live.
December 7, 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
Sumatran tiger sightings triple on Indonesian island
Camera traps on the Indonesia island of Sumatra caught 3 times as many endangered Sumatran tigers as before. The Sumatran tiger is thriving in this region.
December 7, 2025
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
