Asteroids, being rock that doesn’t turn to gas without getting a great deal closer to the Sun, don’t do either of these things, excluding some acceleration from the Yarkovsky effect.

resulting in a gradual push called the Yarkovsky effect. This can build up over millions of years to give asteroids significant speed. Larger asteroids hitting the moon or Mars can also send ...

The movement couldn’t be explained by accelerations that are typical for asteroids, such as the Yarkovsky effect, in which space rocks absorb heat from the sun and then emit it as infrared ...