>>6841205Outgassing from vents on the surface of the object. It's a very small force, but our data was so precise that we could detect it. We think there are lots of frozen gases under the surface of this object, and when it got close to the Sun the surface heated up and those gasses sublimated and erupted through the surface, probably through vents. The Rosetta spacecraft actually imaged this sort of venting on comet 69P/CG. The outgassing occurs mostly on the daytime side of the object, because the daytime side is hotter. That's why outgassing generally pushes objects away from the Sun. That's what we say with `Oumuamua.'
How do I know that? It's literally what the NASAfags who found it said. try harder NPCs