The Solar System - Vocabulary 3

rock that travels through space and can crash into other planets
the line around which an object turns or spins
instrument that shows which direction you are going
to find something for the first time
gas that you cannot see or smell but gives off heat when you burn it
unmanned spaceship that collects data from other planets
very small particles of dirt
line from one end of a circle to the other
about the moon
the rising and falling of sea levels on Earth