Interstellar comet 3I/ATLAS's first reported sighting was on July 1, and it's going to be the closest it's ever been to Earth on Friday. Along the way, it reached several milestones leading up to what ...

On 1 July 2025, astronomers using the ATLAS (Asteroid Terrestrial-impact Last Alert System) survey telescope in Rio Hurtado, Chile, detected a faint, fast-moving object unlike anything seen before.

NASA says it's a comet, but Harvard astrophysicist Avi Loeb believes the object known as 3I-Atlas may be something far more advanced and not natural. He joins "CBS Mornings Plus" to explain why.