For centuries, scientists have sought to understand the origins of meteorites that fall to Earth. Recent research has ...

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 ...

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.