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 ...

Breakthroughs, discoveries, and DIY tips sent every weekday.

The final ESA/Webb Picture of the Month feature for 2025 showcases a festive-looking region filled with glowing clouds of gas ...

Comet 3I/ATLAS is a rare visitor passing briefly through our solar system. Here’s how to find it in the night sky—and what ...

Space telescopes are typically optimized either to study a small patch of the sky across many wavelengths of light or to ...

3I/ATLAS has now made its closest approach to the sun and Earth and is now heading back out toward the outer solar system. On ...

It came from outer space. Interstellar space, to be precise. From somewhere beyond the influence of our sun, possibly from ...

Comet 3I/ATLAS, the third interstellar object ever detected, will swing closest to Earth overnight from Thursday to Friday (Dec. 18 to 19). Here’s how to see it.