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2023’s most-illuminated quarter moon is tonight
Some quarter moons are fuller than others! The most-illuminated quarter moon of 2023 is on December 5. Learn more unique moon dates for 2024.
December 4, 2023
What the Chinese Zhurong rover found beneath Mars’ surface
China's Zhurong rover has found polygonal wedges below the surface in Utopia Planitia on Mars. Freeze-thaw cycles of water and ice likely created the polygons.
December 3, 2023
Kelvin-Helmholtz clouds look like ocean waves
Kelvin-Helmholtz clouds - aka fluctus clouds - can sometimes look like ocean waves. Check out these photos of them!
December 3, 2023
Mirfak is the brightest star in Perseus the Hero
Mirfak is the brightest star in Perseus and is visible even from light-polluted locations. This star is a member of the Alpha Persei Moving Cluster of stars.
December 3, 2023
Deep-sky photos for November 2023: Editor’s picks
Enjoy November 2023's gallery of editor's picks of deep-sky photos from our EarthSky community. If you have a photo to share, submit it to us!
December 2, 2023
Sun activity archive for December 2023
Sun activity archive for December 2023. A daily record of flaring, big filaments and prominences, and other sorts of activity, on our local star.
December 1, 2023
Earth’s magnetic field shields us. But it can move and flip
Earth's magnetic field helps protect life on Earth. But the magnetic poles wander, and they flip polarity every 100,000 to 1,000,000 years.
November 30, 2023
Space Force to track ‘abnormal objects of unknown origin’
The U.S. Space Force wants to track objects near Earth that exhibit 'abnormal observables' and are of 'unknown origin.' Could there be a connection to UAP?
November 30, 2023
Wow! See Mars as ISS astronauts would see it
What if the International Space Station orbited Mars? Space engineers took 3 months to plan this amazing new view of Mars, as ISS astronauts would see it.
November 29, 2023
Nearby exoplanet is Earth twin, but hot as a pizza oven
Astronomers using the Hubble Space Telescope measured the exact diameter of a nearby Earth-sized exoplanet. The sizzling world is too hot for life, however.
November 29, 2023
