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Space
NASA announces Mars rock as a potential biosignature
NASA said at a press conference on September 10, 2025, that a Mars rock explored by the Perseverance rover is a potential biosignature.
September 11, 2025
Astronomy Essentials
Tonight
Visible planets and night sky guide for September
Visible planets and night sky guide. See a video here with beautiful lunar eclipse photos from the EarthSky community. They're terrific!
Earth
Fall hummingbird migration in progress across North America
The fall hummingbird migration typically lasts from August through October. Spot the birds in every U.S. state and Canadian province as they travel south.
September 11, 2025
Earth
Sun
Sun news: Butterfly-shaped coronal hole takes the stage
Sun news September 11, 2025. A butterfly-shaped coronal hole now faces Earth. Its high-speed solar wind could stir auroras in the coming days.
September 11, 2025
Space
Do organics in Enceladus’ plumes really come from its ocean?
Scientists have thought the organics in Enceladus' plumes originate in its ocean. A new study suggests at least some of them might be formed by radiation.
September 11, 2025
Constellations
Cassiopeia the Queen ascends in September and October
Cassiopeia the Queen is an easy-to-find constellation. It has the shape of a W or M. Look in the north-northeast sky on September and October evenings.
September 11, 2025
Space
Mysterious gamma-ray burst is unlike any detected before
Astronomers have spotted a mysterious gamma-ray burst that lasted for a day. This is by far the longest event we've seen of its kind. So what caused it?
September 10, 2025
Space
130 years of data on planetary nebula IC 418 puzzle scientists
Astronomers looked at 130 years’ worth of data on planetary nebula IC 418. They found its central star is heating up faster than any star ever observed.
September 10, 2025
Constellations
Cepheus the King: The constellation that looks like a house
The constellation Cepheus the King is visible from the Northern Hemisphere every night of the year due to its close location to Polaris, the North Star.
September 10, 2025
Space
Meet Earth’s newest quasi-moon, recently discovered 2025 PN7
Earth has a newly discovered quasi-moon! The little space rock 2025 PN7 shares an orbit with Earth and appears to orbit our planet.
September 9, 2025
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