Initial analysis suggested the nucleus was approximately 13.7 kilometers wide (roughly city-sized); however, researchers believe this may have been an overestimate. It is likely a long-period comet ...

Before we say goodbye to our interstellar visitor, another close encounter is on its way. This one could be course-altering.

Above is an image that represents the first time an interstellar object has been captured in an image from the orbit of another planet. That distinction goes to the Chinese Tianwen-1 Mars orbiter, ...

At roughly 250,000 kilometers per hour, comet 3I/ATLAS did not merely pass through the inner solar system it tore through it, fast enough that the Sun could never hope to keep it. That kind of speed ...

CAPE CANAVERAL, Fla. (AP) — NASA unveiled close-up pictures on Wednesday of the interstellar comet that’s making a quick one-and-done tour of the solar system. Discovered over the summer, the comet ...