Recent observations of the interstellar object 3I/ATLAS show that it has developed a faint blueish hue, hinting at a potential color change. This is the third time experts have seen the comet's coloring shift since it was discovered.

Comet 3I/ATLAS, which made a close approach to the sun, has prompted lots of public interest. Kim Kardashian asked NASA's Sean Duffy to spill the "tea"

A team of astronomers monitoring interstellar object 3I/ATLAS have found something a little surprising. Our third confirmed interstellar visitor appears to have changed color for the second time. Meanwhile,

Could a comet be concealing an engine? That is the question now hovering over 3I/ATLAS, the third confirmed interstellar object to pass through our Solar System, after scientists detected a non‑gravitational acceleration and a striking blue coloration near its closest approach to the Sun.

Mystery deepens as 3I/ATLAS deviates near the Sun

Most comets are white, yellow, blue, and occasionally green-but a rare golden comet is now gracing the sky. Dubbed C/2025 K1 (ATLAS), the icy visitor was discovered in May 2025 by the Asteroid Terrestrial-impact Last Alert System.

Two weeks ago, it was hidden behind the Sun, far out of sight. Last week, it reached perihelion, the closest point it will ever get to the Sun. Now, Comet 3I/ATLAS is back and this time, it can be seen from Earth.

I/ATLAS showed signs of non-gravitational acceleration as it passed near the sun, attracting global scientific attention. Harvard Institute’s Avi Loeb spoke with NBC News’ Gadi Schwartz to discuss these new discoveries.