Match the following
1. unit an object that orbits the Sun, is spherical, and has cleared its orbit of other large objects
2. an object that orbits the sun and is large enough for its gravity to make it spherical but that is too small to have cleared its orbit of all other large objects
3. the four inner planets; named for their rocky crusts
4.the four outer planets of the solar system; named for their high concentrations of hydrogen and helium
5. planets a unit of measurement based on the average distance of the earth from the sun; one unit equals 149.6 million kilometers
a. astronomical
b. dwarf planet
c. gas giants
d. planet
e. terrestrial
