The asteroid that the Japanese spacecraft is set to land on does not move according to gravity.

The Japanese spacecraft Hayabusa-2 is set to encounter the asteroid 1998 KY26 in 2031, but its unexpected behavior raises questions. Scientists have noted that the object's acceleration cannot be explained by gravity alone, leading to speculation about its nature. Some suggest it may be a dark comet or an alien object, although the latter is not taken seriously. A recent study challenges the comet theory, indicating the object is too warm for ice to exist inside. The asteroid is smaller than previously thought, complicating the landing process. Researchers are investigating its unusual acceleration, which may be due to gas escaping from ice, but current data suggests it lacks water. Further studies are needed to understand its behavior better.