Comet 3I/Atlas is just the third known object to visit us from outside our solar system. So yes... we'll be talking about aliens.

Looking for a sky event this week? Check out our full Sky This Week column. December 18: Mercury on the move New Moon occurs at 8:43 P.M. EST. This is the best time to view deep-sky objects, so let's ...

Sky This Week is brought to you in part by Celestron. Friday, December 19We're getting ready to say goodbye to the summertime ...

Comet 3I/ATLAS is the third known interstellar comet after 2017's 1I/'Oumuamua and 2019's 2I/Borisov. It was discovered on July 1, 2025 and made its closest approach to the sun in October. Now it is ...

With 3I/ATLAS slated to make its Earth tour in two days, amateur photographers and astronomers alike are scrambling to catch ...

Night sky update for December 17, 2025, covering the moon phase, visible planets, meteor showers, and key space and astronomy news from today ...

The Kitka ensemble winter show, WinterFest at Chabot Space and Science Center, Liam O’Donogue playing funky beats at Eli’s, ...

This week marks the last chance for backyard astronomers to see interstellar Comet 3I/ATLAS before it races on its journey ...

Each Monday, I pick out North America’s celestial highlights for the week ahead (which also apply to mid-northern latitudes ...

Astronomers used major telescopes across the world to probe a cosmic explosion 8 billion light-years from the solar system.

One of the last meteor showers of the year, the Geminids, is set to dazzle stargazers overnight on Saturday. Follow Newsweek live.

On Episode 189 of This Week In Space, Rod Pyle and Tariq Malik talk with their favorite Newspace Buccaneer, Jeffrey Manber.