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Brightest Stars
Algol the Demon Star, named for its strange behavior
What's the scariest star in all the heavens? It's Algol the Demon Star, and you can see it on autumn evenings. Here’s the secret of Algol's creepiness!
October 29, 2026
Space
Origins of Uranus and Neptune are surprisingly different
A new study suggests that the origins of Uranus and Neptune are quite different, even though the 2 planets are similar in many ways.
October 28, 2026
Sun
Sun news: Auroral displays everywhere on this day in 2003
Sun news October 29, 2026: 23 years ago today, on October 29, 2003, a monster X17.2 flare provoked G5 (extreme) geomagnetic storms at Earth.
October 28, 2026
Astronomy Essentials
Tonight
Visible planets and night sky guide for October and November
Visible planets and night sky guide. Late this evening, the gibbous moon hangs between Capella and Aldebaran. Look for the glittering Pleiades cluster nearby.
October 28, 2026
Earth
Goblin sharks, ghost crabs and vampire bats, oh my!
Goblin sharks, ghost crabs and vampire bats: how did these spooky-sounding animals get their names? Learn about them here.
October 28, 2026
Earth
Lake Powell rises more than 10 feet after heavy rains
After heavy rains in October, Lake Powell has risen more than 10 feet. But it still has a long way to go to recover from decades of drought.
October 27, 2026
Space
Habitable worlds: Better than Earth? Scientists wonder
Some scientists think there are more habitable worlds than Earth out there. What are they like? And how might we find them?
October 27, 2026
Constellations
Lacerta the Lizard, home to a blazar
Lacerta the Lizard is a small, dim constellation in the autumn sky that contains a blazar, an active galactic nucleus with a jet aimed toward Earth.
October 27, 2026
Human World
Why do dolls creep us out? It’s the uncanny valley effect
For many, dolls creep us out. Their lifelike - but not quite human - aspect can trigger the uncanny valley effect. Hear more from scientists about this effect.
October 27, 2026
Moon Phases
How to understand moon phases: 4 tips!
As the moon orbits Earth, we see varying fractions of its day side. Here are four tips for understanding moon phases.
October 25, 2026
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