Stuff in space
Meteors, Meteorite, and Meteoroids
These are smaller than asteroids. A meteoroid is still in space, a meteor is when it enters the atmosphere, and a meteorite is when it hits the ground.
A comet has a frozen nucleus surrounded by a coma, which is a spherical ball of gas. The dust tail is made of dust and the ion tail if composed of charged gas. The tail faces away from the sun due to solar wind. A famous comet is Haley's comet.