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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
Human World
Pentagon UAP files part 7: Silent black triangles
The 7th batch of the Pentagon UAP files was released on October 23, 2026. The documents include reports of more triangle craft and more.
October 25, 2026
Sun
Sun news: Happy 20th birthday, STEREO!
Sun news October 25, 2026: Happy 20th, STEREO! The twin probes first showed CMEs in 3D. Today, a glancing CME could bring a G1 storm and auroras.
October 25, 2026
Space
Is the Mars Grand Canyon still tectonically active?
Researchers said the red planet is still tectonically active today. A team found the epicenter of a marsquake at the Grand Canyon of Mars.
October 25, 2026
Astronomy Essentials
Tonight
Visible planets and night sky guide for October
Visible planets and night sky guide. Tonight at sunset, look for the full Hunter's Moon. It'll rise in the east as the sun sets and shine all night long.
October 25, 2026
Astronomy Essentials
Olbers’ paradox asks ‘Why is the night sky dark?’
Olbers' paradox asks why is space dark if the universe is filled with stars. The answer has to do with traveling light and red-shifting colors.
October 23, 2026
Space
1st photo of Earth from space, 80 years ago
On October 24, 1946 — 80 years ago — a movie camera on board a V-2 rocket captured the 1st-ever photo of Earth from space.
October 23, 2026
Space
Why does anything exist? New theory emerges
Why does anything exist? A new theory suggests a forgotten particle might have shifted the balance between matter and antimatter.
October 22, 2026
Space
Lucy mission to Trojan asteroids: 5 years of discoveries
NASA’s Lucy mission is now less than a year from reaching the Trojan asteroids near Jupiter. And it has already made some exciting discoveries along the way.
October 22, 2026
Constellations
Cassiopeia and Perseus on October evenings
Cassiopeia and Perseus are neighbors in the autumn sky. Use Cassiopeia's distinctive W or M shape to locate the dimmer Perseus on autumn and winter evenings.
October 22, 2026
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