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Astronomy Essentials
Tonight
Visible planets and night sky guide late September and October
Visible planets and night sky guide. Join us for a livestream at noon CDT (17 UTC) on Wednesday, September 30. We are saying goodbye to evening Venus!
September 30, 2026
Space
JUICE mission completes flyby of Earth: New pics!
The JUICE mission made a successful flyby of Earth on September 28. See new images of Earth and the moon here. The spacecraft will reach Jupiter in 2031.
September 30, 2026
Space
Water systems on early Mars were complex and hot
NASA's Perseverance rover has found evidence of ancient complex water systems on early Mars, including hot hydrothermal activity.
September 30, 2026
Space
Mars calendar year begins September 30: Happy New Year, Mars!
Mars calendar year 39 begins on September 30, 2026. If you’re looking for a reason to celebrate, here’s to a Happy New Year ... on Mars.
September 30, 2026
Sun
Sun news: Near-M flare! Is the sun waking up?
Sun news, September 30, 2026: Our star surprised us with an almost-M flare. It was a C8.6 flare from active region AR4535. Is the sun waking up?
September 30, 2026
Brightest Stars
Alpha Cephei, or Alderamin, is a fast-spinning star
Meet Alpha Cephei, in the constellation Cepheus the King. It’s spinning so fast that it appears like a slightly flattened beach ball.
September 30, 2026
Spaceflight
Starship reaches Earth’s orbit for 1st time
SpaceX's Starship spacecraft finally reached Earth's orbit in its 14th test flight on September 28. Though successful, the flight was not without its flaws.
September 29, 2026
Space
Weather on exoplanets: Decoding the atmosphere of SIMP 0136
Researchers in Ireland have found a new way to decode the weather on exoplanets. They started with the planetary-mass object SIMP 0136.
September 29, 2026
Tonight
Watch for the daytime moon after sunrise this week
Watch for the beautiful daytime moon this week, a pale orb floating against a blue sky in the morning hours. Look west! You'll see it!
September 29, 2026
Constellations
Equuleus the Little Horse on autumn nights
Equuleus the Little Horse is a diminutive constellation that lies south of the Summer Triangle. Autumn nights are a great time to view the Little Horse.
September 29, 2026
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