Only larger objects have strong enough self-gravity to force themselves into a s
ID: 153829 • Letter: O
Question
Only larger objects have strong enough self-gravity to force themselves into a spherical shape. The first asteroid discovered, Ceres, is round and was originally classified as a planet. However, it is no longer considered a planet because many other smaller objects were found to exist within its orbit in the asteroid belt.
Pluto was discovered later and was classified as a planet. It’s larger than Ceres, is made of ice and rock, and is significantly farther from the Sun than the asteroids. Is it scientifically justifiable to classify Pluto as a planet, but not Ceres? Comparing Pluto to the other planets may answer this.
Explanation / Answer
The answers are C and B
Plantets in outer solar system are mostly comprised of hydrogen and helium, but pluto, apart from these is madeup of ice and rocky.
Th elliptical nature of the planets does not describe the properties of pluto.
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