Oumuamua seemed to accelerate as it moved away from the sun. A space rock moving only due to gravity shouldn't do this, though a comet might. Gravity slingshot

Oumuamua seemed to accelerate as it moved away from the sun. A space rock moving only due to gravity shouldn't do this, though a comet might. Gravity slingshot. Humans have used that effect themselves. There's nothing mysterious about it. https://mathpages.com/home/kmath114/kmath114.htm https://mathpages.com/home/kmath114/kmath114.htm