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Astronomy Essentials
Tonight
Visible planets and night sky guide for October
Visible planets and night sky guide. The moon is past new now and soon will return to our evening sky. Can you see the moon low in the west after sunset on October 12?
October 12, 2026
Earth
Arizona’s Chiricahua poised to become 64th US National Park
Chiricahua National Monument in the southeastern corner of Arizona is poised to become the U.S.'s 64th national park. Read more about it here.
October 11, 2026
Clusters Nebulae Galaxies
Check out the Double Cluster in Perseus on October evenings
The Double Cluster in Perseus is a breathtaking pair of open star clusters, easy to see in October. Here's how to find it in your sky.
October 11, 2026
Earth
Isaias is a major hurricane, headed for the Gulf Coast
Hurricane Isaias is the 1st hurricane of the 2026 Atlantic season. It is now a major hurricane, making landfall around midnight tonight near Pensacola.
October 9, 2026
Space
Another satellite breakup raises concerns about space junk
An inactive Soviet weather satellite has broken apart above Earth. The satellite breakup has added tens of debris fragments to an already crowded low-Earth orbit.
October 9, 2026
Space
Did formaldehyde on ancient Mars help kickstart life?
Formaldehyde in the ancient rains on Mars might have provided crucial chemical reactions needed for life to begin on the red planet billions of years ago.
October 9, 2026
Today's Image
Smile mission releases its stunning 1st aurora footage!
The Smile mission has shared its first footage of Earth's auroral oval at the North Pole, and it's a stunner! Read more about the mission here.
October 9, 2026
Tonight
Mercury after sunset and great for Southern Hemisphere!
Southern Hemisphere, look for Mercury after sunset. It's your best shot at seeing the planet in your evening sky all year.
October 9, 2026
Earth
Why leaves change color in the autumn
Did you know the vivid colors of autumn leaves are there throughout spring and summer, but hidden? Here's why leaves change color in the fall.
October 9, 2026
Astronomy Essentials
Meteor shower guide 2026: Up next … the Orionids
Up next is the Orion meteor. They are best viewed around the mornings of October 21. Check EarthSky's meteor shower guide here.
October 9, 2026
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