Key Developments Harvard astrophysicist Avi Loeb has revealed that 3I/ATLAS, the interstellar object that passed closest to the Sun on its perihelion journey, displayed the first confirmed evidence of non-gravitational acceleration during its solar approach. NASA engineer Davide Farnocchia from the Jet Propulsion Laboratory documented the anomaly at a distance of 203 million kilometers from Interstellar object 3I/ATLAS shows non-gravitational acceleration near Sun. NASA data reveals two-component push. December 19 observations will test natural vs. artificial origin.