Solar System Vocab
The path that an object such as a
planet makes as it revolves around a
second object
orbit
The movement of any object in orbit,
such as the Earth moving around the
sun, which takes 365 ¼ days to
complete
revolution
The motion of a planet as it turns on
its axis. This takes 24 hours to
complete.
rotation
An imaginary line which runs
through both poles of a planet
axis
An object that moves around
another object in space
satellite
The different shapes the moon
seems to have as it orbits around the
Earth
phases
A huge burning sphere of gases
star
A group of objects in space that
move around a central star
solar system
A large object that moves around a
star
planet
Greek astronomer who believed in
the Earth centered model.
GEOCENTRIC
Aristotle
Egyptian astronomer who believed
in the Earth centered model
GEOCENTIC
Ptolemy
Polish astronomer who challenged
the Geocentric model.
He introduced the sun-centered
model~ HELIOCENTRIC
COPERNICUS
Italian astronomer who believed
Copernicus’ sun-centered model was
correct because of improvements he
made to his telescope
*He was also put in jail because of
his belief.
Galileo