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Astronomy Essentials
2024 Eta Aquariid meteor shower: All you need to know
May's Eta Aquariid meteor shower is good over several mornings. Try Saturday morning, May 4! Best mornings might be May 5 and 6 in the hours before dawn.
May 3, 2024
Earth
Tyrannosaurus rex not so smart, after all
Tyrannosaurus rex dinosaurs had huge skulls, but does that imply they were very smart? Were they as intelligent as monkeys? Crocodiles?
May 3, 2024
Earth
Brazil floods engulf state of Rio Grande do Sul
Brazil floods have inundated the state of Rio Grande do Sul, with houses washed away and rescues ongoing. See more about this and other floods.
May 3, 2024
Astronomy Essentials
Tonight
Visible planets and night sky guide for May
Visible planets and night sky guide for May 2024. Watch for the moon, Saturn, Mars and Mercury in the next few mornings. Will you see Mercury? It's hard to see.
May 3, 2024
Earth
Mammatus clouds are ominous and beautiful
Mammatus clouds look like bubbling, low-hanging clouds. They're often associated with thunderstorms. Learn more about them here and see photos.
May 3, 2024
Brightest Stars
Sun
Sun news May 3: KABOOM, X flare! Big storm at Earth
Sun news for May 3, 2024. Kaboom! X flare from recently arrived AR3663. And an unexpected G3 storm brought some auroras - more tonight?
May 3, 2024
Space
Did Webb find signs of life on exoplanet K2-18 b?
NASA's Webb telescope looked at the sub-Neptune exoplanet K2-18 b. It found methane, carbon dioxide, a possible ocean, and even ... maybe ... a biosignature.
May 2, 2024
Space
The strange case of methane on Mars: Possible new answers
New experiments show that methane on Mars, in Gale crater, may seep out of the ground when hard crusts of perchlorate salt temporarily warm up and weaken.
May 2, 2024
Astronomy Essentials
Mercury farthest from the sunrise on May 9
Mercury reaches its greatest elongation - greatest distance from the sunrise - on May 9, 2024. Look east at dawn. It'll brighten for the next few weeks.
May 2, 2024
Space
See the Martian spiders of Inca City in new images
Martian spiders? Inca City? Both geologic features on Mars. The European Space Agency (ESA) just released new images of them. Take a look!
May 2, 2024
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