The interstellar comet 3I/ATLAS is barreling toward its closest point to the sun as perihelion looms on Oct. 29. How different will it look when it reappears on the other side?

Over the past seven decades, thousands of sophisticated spacecraft have been launched on ambitious missions to look down on ...

3I/ATLAS is the third confirmed interstellar object to whoosh through our solar system, after 1I/ʻOumuamua (discovered in ...

Comet Lemmon will have its closest brush with Earth on or around Tuesday, Oct. 21. Comet SWAN should have its flyby with ...

Comet C/2025 A6 (Lemmon) is this year’s brightest comet visible from Earth—an icy relic from the solar system’s origins that ...

What makes 3I/ATLAS especially intriguing is that the comet might be three billion years older than our entire Solar System.

This long-duration comet will make its closest approach to Earth this fall, before disappearing into the outer solar system ...

As you can see on the star chart, Comet Lemmon starts the month below the Plough, and then moves through Boötes into Serpens, ...

Just in time for Hallowe'en in 2024, Hubble and JWST captured an image of two interacting spiral galaxies — IC 2163 and NGC ...

Astronomers have found signs that the small icy world Chiron, orbiting between Saturn and Uranus, may be forming a new ring ...

Scientists at Brazil’s Pico dos Dias Observatory have, for the first time, successfully observed the process of formation of ...