Earth and Space Thing
Meteors and Comets
A comet is an icy body that releases gas or dust. Comets contain dust, ice, carbon dioxide, ammonia, methane and more. Some researchers think comets might have originally brought some of the water and organic molecules to Earth that now make up life here. It revolves around the sun with the nucleus and coma pointing towards the sun and the tail pointing away from the sun.
a comet has a nucleus, a coma, and it has a dust/ion tail
Halley is the best-known of the short-period comets and is visible from Earth every 75–76 years, Halley is the only short-period comet that is clearly visible to the naked eye from Earth, and the only naked-eye comet that might appear twice in a human lifetime. Halley last appeared in the inner Solar System in 1986 and will next appear in mid-2061.
A meteorite is a meteor that survives its passage through the earth's atmosphere such that part of it strikes the ground. More than 90 percent of meteorites are of rock, while the remainder consist wholly or partly of iron and nickel.
a small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light.
A meteoroid is a small body moving in the solar system that would become a meteor if it entered the earth's atmosphere.