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Space
Distant proto-supercluster! An early intersection point in the cosmic web?
Astronomers have found the most distant proto-supercluster yet, an early collection of galaxies at a junction in the cosmic web.
September 11, 2026
Earth
International Cloud Appreciation Day is September 11
The international Cloud Appreciation Day is September 11, 2026. Learn how to participate here and see a gallery of beautiful clouds.
September 11, 2026
Today's Image
Anak Krakatau erupts in Indonesia, 8 people missing
Anak Krakatau erupted in early September, sending gas and ash into the atmosphere. 8 people, including 5 journalists, are now missing.
September 11, 2026
Astronomy Essentials
What is retrograde motion? And why is the moon moving backwards?
What is retrograde motion? See an image that appears to show the moon moving backwards! An explanation, and more bizarre examples, here.
September 11, 2026
Sun
Sun news: Another massive eruption in the sun’s northwest
Sun news September 11, 2026: The far-side region behind yesterday's northwest prominence erupted again, blasting outward even bigger!
September 11, 2026
Space
Do black holes have hidden hair? Scientists are searching
If black holes have extra matter around them - aka hidden hair - astronomers could find it by measuring the different characteristics of these ripples.
September 10, 2026
Astronomy Essentials
Zodiacal light: Start watching for it now
The zodiacal light is an eerie light extending up from the horizon before dawn around the Northern Hemisphere autumn. Southern Hemisphere? Look after sunset!
September 10, 2026
Earth
What is an Equal Earth projection map? See comparisons here
Everyone is familiar with the Mercator map, a flattened view of Earth. But what is the Equal Earth projection map, and how does it compare?
September 10, 2026
Astronomy Essentials
Tonight
Visible planets and night sky guide for September
Visible planets and night sky guide: New moon is September 11. And the September equinox is near. Time to look for the zodiacal light! Look east before dawn. Southern Hemisphere? Look west after evening twilight ends.
September 10, 2026
Brightest Stars
Delta Cephei helps measure cosmic distances
Delta Cephei is an inconspicuous variable star in the northern constellation Cepheus the King. This important star helped establish the cosmic distance scale.
September 10, 2026
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