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Human World
If we find life beyond Earth, how will nations respond?
If we ever find life beyond Earth, how will the nations of the world respond? A group of experts give 3 possibilities: cooperation, competition and isolation.
September 6, 2026
Constellations
Octans and Apus circle the south celestial pole
Octans and Apus are 2 constellations that you have to be in the Southern Hemisphere to see. Plus, Octans is home to the south celestial pole.
September 6, 2026
Sun
Sun news: Bam bam! The sun issues a 1-2 punch
Sun news September 5, 2026: Bam bam! Two eruptions in quick succession sent prominences soaring from both eastern limbs. Their CMEs look set to miss Earth.
September 5, 2026
Astronomy Essentials
Tonight
Visible planets and night sky guide for September
Visible planets and night sky guide: Tomorrow morning, the crescent moon will hang close to the red planet Mars with bright Jupiter closer to the horizon.
September 5, 2026
Space
Mars’ southern hemisphere is unusually hot deep underground
A new study from Caltech shows that Mars' southern hemisphere is much hotter than expected deep below the surface. Why is that?
September 4, 2026
Constellations
Cassiopeia the Queen ascends in September and October
Cassiopeia the Queen is an easy-to-find constellation. It has the shape of a W or M. Look for it in the north-northeast sky on September and October evenings.
September 4, 2026
Space
Saturn’s south pole decagon confirmed! A mysterious 10-sided figure
Saturn’s south pole is now known to have a giant, evolving 10-sided wave, similar to the Saturn north pole hexagon. Read more about it here.
September 3, 2026
Earth
Today's Image
Hurricane triplets spin across the Pacific Ocean
Rare hurricane triplets are currently spinning across the Pacific Ocean: Lowell, Karina and Marie. Did El Niño play a part? Find out here.
September 3, 2026
Space
BepiColombo mission 1 step closer to Mercury today
The BepiColombo mission has been maneuvering its way into orbit around Mercury for 8 years. On September 3, it successfully released 2 orbiters.
September 3, 2026
Space
Giant mega-Earth is 23 times more massive than Earth
Astronomers have discovered a new giant mega-Earth exoplanet that is a whopping 23 times as massive as Earth and 2.5 times its diameter.
September 3, 2026
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