"The consequences, should the hypothesis turn out to be correct, could potentially be dire for humanity," said Avi Loeb.

From tracking a rare interstellar visitor to revealing hidden star systems, the SETI Institute is at the forefront of space ...

NASA’s Hubble Space Telescope has snapped images of a recently discovered interstellar visitor hurtling through our solar system. Traveling at 130,000 mph, 3I/ATLAS is the fastest comet ever observed ...

KENNEDY SPACE CENTER, Fla. - NASA’s Hubble Space Telescope has captured the most detailed image yet of the interstellar comet 3I/ATLAS, which is thought to have originated well outside the Milky Way.

A diagram shows Comet Leonard in the eastern sky before sunrise on Dec. 2, 2021, as seen from New York City. (Image credit: Starry Night) It is unusual to see a comet at its best: Most comets are ...

This diagram provided by NASA/JPL-Caltech shows the trajectory of interstellar comet 3I/ATLAS as it passes through the solar system. Credit: NASA/JPL-Caltech via AP ...

Comet C/2014 UN271, aka Bernardinelli–Bernstein, is already releasing gas, even though it's still far from the sun's heat in the solar system.