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Today's Image
See the Martian moon Phobos fly over a dust storm
See the Martian moon Phobos as it passes over iconic landscapes on the red planet, including a trio of volcanoes and the largest canyon in the solar system.
December 31, 2025
Astronomy Essentials
New Year’s Star Sirius, the moon and Jupiter ring in 2026
Entertain your friends on New Year's Eve by showing them the New Year's Star, the soon-to-be full supermoon and Jupiter. Sirius is highest at midnight.
December 31, 2025
Human World
Why does the New Year begin on January 1?
Why does the New Year begin on January 1? The tradition stems from the festival of Janus, the Roman god of past and future.
December 31, 2025
Sun
Sun news: Auroras could kick off the New Year!
Sun news December 31, 2025: The New Year might kick off with a beautiful round of auroras, as a CME and a stream of fast solar wind approach Earth.
December 31, 2025
Astronomy Essentials
Tonight
Visible planets and night sky guide for December and January
Visible planets and night sky guide. Today at noon (18 UTC) watch Deborah Byrd’s livestream explaining a rare, triple cosmic event to start the new year.
December 31, 2025
Space
Superkilonova: Double explosion could be first ever seen
Astronomers have detected a strange double explosion of a star and hypothesize that it is a kilonova following a supernova: a superkilonova.
December 30, 2025
Clusters Nebulae Galaxies
The Orion nebula (M42) is a starry nursery
You can see the Orion nebula as a fuzzy spot in the sky using just your eyes. It's really a vast cloud in space where new stars are forming. Learn more.
December 30, 2025
Astronomy Essentials
Earth flies between Jupiter and the sun January 10
Giant Jupiter is closest to Earth for 2026 on January 9. Then Earth will fly between the sun and Jupiter - bringing Jupiter to opposition - on January 10.
December 29, 2025
Space
NASA’s SPHEREx observatory completes stunning 1st cosmic map
NASA's SPHEREx has produced its 1st cosmic map, revealing the entire sky in 102 colors. Take a look at this spectacular map.
December 28, 2025
Constellations
Orion the Hunter, the most recognizable constellation
Orion the Hunter may be the most recognizable constellation, visible from both hemispheres. It's best in winter from the north and summer from the south.
December 28, 2025
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