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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
Astronomy Essentials
Tonight
Visible planets and night sky guide for September
Visible planets and night sky guide: The moon reaches 3rd quarter today, rising about midnight to set around noon. Look for the daylight moon tomorrow morning!
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
Constellations
Corona Australis is the sparkling Southern Crown
Corona Australis is a dim constellation lying below the Teapot asterism of Sagittarius. Its sparkling, curving shape befits its name.
September 3, 2026
Space
Roman space telescope has launched! You can adopt a pixel
The Nancy Grace Roman Space Telescope launched on August 30 from the Kennedy Space Center. Want to add your name to a pixel? Find out how here!
September 2, 2026
Earth
Lake Powell hits record low, continues to drop
Lake Powell has hit its lowest level ever. Despite the monsoons, like the flash floods that hit Grand Canyon over the weekend, water levels continue to drop.
September 2, 2026
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