Neil deGrasse Tyson, The Pluto Files What is the main idea of this paragraph?
A. Mercury, Venus, Earth, and Mars are considered rocky, terrestrial
objects instead of planets.
B. Pluto was considered just another icy object that was found in
abundance in the solar system.
C. Jupiter, Saturn, Uranus, and Neptune are filled with gas and are
therefore considered gas giants.
D. The exhibit at the Hayden Planetarium didn't classify Pluto the
same way it classified other planets.
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