Harvard astrophysicist Avi Loeb says data on 3I/ATLAS show unexplained acceleration and colour anomalies, urging scientists not to dismiss the evidence as mere error.

According to the study, interstellar object 3I/ATLAS showcased its first sign of a non-gravitational acceleration at perihelion, or the point of closest approach to the Sun. The non-gravitational acceleration was detected at a perihelion distance of 1.36 times the Earth-Sun separation, equivalent to 203 million kilometers.

Comet 3I/ATLAS, the third interstellar object ever recorded, is currently passing through our solar system. Discovered on July 1, 2025, by the ATLAS s

Astronomers detect unexplained acceleration in interstellar object 3I/ATLAS as Avi Loeb suggests an artificial 'engine' can't yet be ruled out.

Astronomers have identified Comet 3I/ATLAS as an interstellar object, making it only the third confirmed visitor from outside our solar system, according to NASA.<br /><br />The comet is travelling on a hyperbolic trajectory,

I/ATLAS made its closest approach to Earth on 29 October 2025, coming within 1.8 astronomical units, or around 167 million miles.

Avi Loeb appeared on The Joe Rogan Experience podcast, where interest in the Interstellar visitor 3I/ATLAS was revived. The Harvard astrophysicist suggested that the object might be more than a normal comet.

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.