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Space
Asteroid Bennu’s boulder mystery solved
Asteroid Bennu's boulder mystery has now been solved, scientists say. Highly porous rocks explain the abundant large rocks but lack of fine sand-like regolith.
October 27, 2021
Space
Today's Image
Andromeda Galaxy photos, 2021
Enjoy a photo gallery of the best Andromeda Galaxy images from EarthSky readers! The Andromeda Galaxy is a great observing target on fall evenings.
October 27, 2021
Earth
The fate of Arctic sea ice
Our warming world means the fate of Arctic sea ice could be in peril, along with the plants, animals and rich ecosystem that call it home.
October 26, 2021
Astronomy Essentials
Space
Heads up! Famous comet 67P/C-G nearly closest
Famous comet 67P/C-G will sweep closest to Earth in November. Finder charts help you locate this comet before it leaves for another 193 years.
October 26, 2021
Astronomy Essentials
Human World
Halloween is an astronomical holiday
The 4 cross-quarter days fall between equinoxes and solstices. Halloween is the spookiest one. It comes from a festival of ancient Celts and Druids.
October 26, 2021
Space
Watch the Progress 79 cargo launch October 27
On October 27, 2021, Russia’s uncrewed Progress 79 cargo craft will launch from the Baikonur Cosmodrome in Kazakhstan. Here’s how to watch.
October 26, 2021
Astronomy Essentials
Flashing star in autumn? Here are 3 candidates
Some October night, check out 3 of the flashiest stars in the night sky ... at least at this time of year. Why a flashing star flashes, here.
October 26, 2021
Earth
True polar wander: A shift 84 million years ago
The fossil magnetism of rocks in Italy revealed true polar wander - a major shift in Earth's outer shell relative to its spin axis - 84 million years ago.
October 25, 2021
Clusters Nebulae Galaxies
Double Cluster in Perseus on October evenings
The Double Cluster in Perseus is a breathtaking pair of star clusters, easy to see in October. How to find it in your sky.
October 25, 2021
Space
See 42 of the largest asteroids in new images
Astronomers with the European Southern Observatory (ESO) have obtained new and more detailed images of 42 of the largest asteroids in the main asteroid belt.
October 24, 2021
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