Which would be the most accurate statement regarding the composition of astronomical objects?
a. Nebulae and stars are made of gasses, while all planets and dwarf planets are made completely of rock.
b. Asteroids and some planets are made of rock, while comets are made of rock, dust, and ice.
c. Comets and stars are made of rock, while asteroids are composed of cool gases.
d. Galaxies are made up of planets, while nebulae are made only of rock.



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