Key VocabularyComet: A "dirty snowball" made of dust, ice, and rock. Often seen with a tail of debris based on where the sun is melting it
Asteroid: A space rock (often from the area between Mars and Jupiter). Meteor: A space rock that enters the earth's atmosphere and is often seen as a streak of light (shooting star) Meteorite: A space rock that does not burn up in the atmosphere and reaches the earth's surface |