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Space
Astronomers spot 1st giant stream of stars between galaxies
Astronomers have found the 1st giant stream of stars outside a galaxy. It lies among the galaxies in the Coma cluster, and it may shed light on dark matter.
December 6, 2023
Today's Image
Exoplanet art lets you visualize alien worlds
Enjoy the exoplanet art of Martin Vargic. Martin illustrated more than 1,000 exoplanets based on astronomers' discoveries of alien worlds around other stars.
December 6, 2023
Brightest Stars
Sun
Sun news: Small new region brings big action
Sun news for December 6, 2023. New active region AR3513 is the origin of a large increase in activity including 3 M flares.
December 6, 2023
Astronomy Essentials
Visible planets and night sky for December
Visible planets: Venus dominates the morning sky. Bright Jupiter is visible in the night. Saturn shines after sunset. Mercury is low in the evening twilight.
December 6, 2023
Space
1st planet-forming disk found in another galaxy
For the first time, astronomers have discovered a planet-forming disk around a young star in another galaxy outside our own Milky Way galaxy.
December 5, 2023
Brightest Stars
Aldebaran is Taurus the Bull’s bloodshot eye
Aldebaran, the brightest star in Taurus the Bull, is at one tip of a V-shaped cluster. If placed where our sun is, its surface would pass the orbit of Mercury.
December 5, 2023
Moon Phases
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
Astronomy Essentials
What’s a red dwarf? Only the most abundant Milky Way star
A red dwarf star is smallest and coolest type of star known. They're also extremely common, making up around 60 to 70% of the stars in the Milky Way.
December 3, 2023
Space
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
Earth
Kelvin-Helmholtz clouds look like ocean waves
Kelvin-Helmholtz clouds - aka billow clouds or shear-gravity clouds - can sometimes look like ocean waves. Check out these photos of them!
December 3, 2023
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