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earth science: planets

Across
The outer 4 planets are made up of mainly ________ and helium
The fifth largest planet
The outer 4 planets in our galaxy (farthest from the sun)
The largest planet
___________ _____ is used to measure distance in space (equal to the distance between the sun and earth)
________ planets are the inner 4 planets named for their rocky crusts
Mercury and _____ are the planets closest to the sun
Down
A planet must be _________ in shape due to its gravitational pull
Pluto and Eris are called ________ ________
A planet must ______ a star
The most dense planet
The planet farthest from the sun
The outermost region of the solar system filled with icy objects is called the ______ ________
The smallest planet