The interstellar comet 3I/ATLAS made its closest approach to Earth today (Dec. 19, 2025). Here's the latest news you need to ...

I/ATLAS has passed its closest point to Earth, meaning we will soon lose sight of it for good. Some scientists want to send a spacecraft to chase down the alien comet — or the next interstellar object ...

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 ...

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 ...

While online conspiracies swirl, comet 3I/ATLAS made a close pass by Earth on Dec. 19, giving astronomers a rare glimpse of a ...

NASA has now confirmed that 3I/ATLAS is not just another visitor from deep space but the largest interstellar comet ever ...

The comet, which will come within roughly 167 million miles (270 million kilometers) of our planet, will be tracked by telescopes around the world so astronomers can pinpoint its location and make ...

Interstellar Comet 3I/ATLAS makes its closest Earth pass early on Dec. 19. Here's what astronomers know about its origin and ...

Then there was the September discovery of C/2025 R2 (SWAN), a comet so bright that even when it was near the moon on ...

On Dec. 19, 3I/ATLAS will be about 1.8 astronomical units away (170 million miles), almost twice as far as the average ...

The two green comets continue to shine brightly in twilight each evening for lucky skywatchers with binoculars in the Northern Hemisphere. For observers on Friday, Oct. 24, the bright Comet Lemmon ...

No two comets are exactly alike. While SWAN’s orbit is very well aligned with the plane of the planets as they orbit the sun, Lemmon’s orbit is highly inclined, tipped by more than 140 degrees, ...