Comets
Comets have layers nucleas the center of the ball of frozen gases and dust
METEORITES
Meteorites are space rocks that have hit a planet and survived its atmosphere.
Meteoroids
Asteroids
Credits:
Created with images by WikiImages - "star clusters galaxy star" • 1980supra - "space stars photoshop" • Bistrosavage - "Sikhote Alin" • [fluxa] - "Fusion Crust" • NASA Goddard Photo and Video - "NASA’s Hubble Telescope Finds Potential Kuiper Belt Targets for New Horizons Pluto Mission"