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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
Astronomy Essentials
Tonight
Visible planets and night sky guide for October
Visible planets and night sky guide. You might still see some Orionid meteors! And find out about the ancient traditions of Halloween in a video, here.
October 22, 2026
Space
Surprising colors of white dwarf stars revealed for 1st time
Astronomers in the U.K. have found that the true colors of white dwarf stars can vary greatly. They even found the 1st known green star.
October 21, 2026
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
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
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
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