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Space
Euclid was mapping the universe. Then it found a comet
The Euclid space telescope made an accidental comet discovery as it searched the universe for evidence of dark matter and dark energy.
October 21, 2026
Astronomy Essentials
Tonight
Visible planets and night sky guide for October
Visible planets and night sky guide. The moon hangs near Fomalhaut tonight. And see a video today at noon CDT (17:00 UTC) about the ancient origin of Halloween.
Favorite Star Patterns
Pegasus is a baseball diamond! Just in time for the World Series
The Great Square of Pegasus is tilted to look like a baseball diamond in October, as if to celebrate baseball's World Series.
October 21, 2026
Sun
Sun news: Fast wind arrives, and more to come
Sun news October 21, 2026: Fast solar wind arrived but fell short of a G1 storm, peaking at Kp 4. A second coronal hole now faces Earth. More to come!
October 21, 2026
Constellations
Auriga the Charioteer and bright Capella on October evenings
Auriga the Charioteer is a north circumpolar constellation, best viewed on autumn and winter evenings. Its star Capella is the 6th brightest star in the sky.
October 21, 2026
Earth
It’s official! Chiricahua is now the 64th US national park
On October 20, 2026, Chiricahua National Park in the southeastern corner of Arizona became the U.S.'s 64th national park.
October 21, 2026
Earth
New clues to how infectious fungus Candida auris resists antifungals
Scientists have identified new resistance mechanisms used by the fungus Candida auris, paving the way for advances in antifungal treatments.
October 20, 2026
Astronomy Essentials
Orionid meteor shower 2026: All you need to know
The Orionid meteor shower is here! Find out where and when to look up with our charts and viewing tips.
October 20, 2026
Tonight
See brightest star, Sirius, in your morning sky
Out late at night or before dawn? Look for the sky's brightest star, Sirius, a brilliant beauty. You'll know it's Sirius if you see Orion's Belt pointing to it.
October 20, 2026
Earth
New dinosaur species identified from fossil stashed in drawer for a century
Researchers identified a new dinosaur species from a fossil on Isle of Wight in the UK. The carnivorous dino would have been as tall as a human.
October 18, 2026
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