While most scientists believe it’s a natural comet, one Harvard astronomer has suggested its unusual features could hint at signs of alien technology. View on euronews

Interstellar comet 3I/ATLAS is passing safely through our solar system. Learn about its discovery, its distant path, and why NASA is using Hubble, Webb, and more to study it.

NASA and the International Asteroid Warning Network have launched a global campaign to track comet 3I/ATLAS and strengthen Earth’s asteroid defense.

Loeb said some answers could come from images of 3I/ATLAS that were taken Oct. 2 by NASA’s HiRise camera on the Mars Reconnaissance Orbiter around the time the federal government shut down. The information has not yet been released, he said.

I/ATLAS has unexpectedly become bluer than the Sun, hinting that it could be emitting light, not just reflecting it — a sign it may be composed of something far beyond ordinary comet material.

The interstellar object 3I/ATLAS has astonished astronomers by turning distinctly blue and rapidly brightening as it neared the Sun on October 29, 2025. Observations from multiple space-based solar observatories have revealed unexplained optical changes,