Our solar system's famous "invader" might be as old as the Milky Way itself.

New data from the James Webb Telescope has identified an unusually high concentration of deuterium in the interstellar comet ...

In the vast expanse of the cosmos, where time stretches across unimaginable scales, some objects stand out as cosmic time capsules. One such object is the interstellar comet3I/ATLAS, a mysterious ...

The European Space Agency (ESA) has released a video of interstellar comet 3I/ATLAS, constructed from images taken by a probe ...

Remember 3I/ATLAS? Yes, the interstellar comet that made plenty of headlines in 2025 is still romping through our solar system.

The interstellar comet 3I/ATLAS is leaving our solar system. See new photos from a European Space Agency orbiter on its way to Jupiter.

Loeb set imaginations afire last year when he began raising questions about the object’s irregularities.

So it shouldn’t come as a surprise that Harvard astronomer Avi Loeb — who has long posited that mysterious interstellar ...

Is 3I/ATLAS following its heart? Harvard scientist Avi Loeb believes that 3I/ATLAS boasts a “heartbeat”-like pulse that could provide evidence of its artificial origins — potentially even pointing to ...

The comet 3I/ATLAS is taking a long holiday journey this year. It’s visiting from another solar system altogether. Those interstellar origins... What to know about the 3I/ATLAS comet and why people ...

The Post's complete guide to catching 3I/ATLAS as it makes its closest approach to Earth on December 19. Here’s how to keep your 3I on it. With 3I/ATLAS slated to make its Earth tour in two days, ...