natural satellite
sphere of buring gas
source of heat and light for our solar system
4 times larger than the moon
sphere of rock
29 days to revolve around Earth
no real surface
3rd planet from the sun
a million times bigger than Earth
rotates on its axis every 24 hours
surface scarred and cratered
has water and atmosphere
medium-sized star
rotates on an axis
only planet to support life
no atmosphere and no life