[IYAS9YAS]

What’s the difference between a meteoroid and an asteroid?

Size. Asteroids (rock) and comets (dust/gas) are the primary sources of meteoroids. A meteoroid is only called that while in space. When it hits our atmosphere, it becomes a meteor, and if it makes it to the ground instead of vaporizing in the atmosphere, is becomes a meteorite.

[SunkenCiv]

Thanks IYAS9YAS, Erik Latranyi, and BradyLS.