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An icy world beyond Neptune was spotted in 1930, the first of its kind. It was:
AEris
BVesta
CPluto
DCeres
Answer & Solution
Correct answer: C. Pluto
1. More such worlds turned up later.
2. This one came first.
3. It was Pluto.
_Source: OpenStax Astronomy 2e, Chapter 7, Other Worlds: an Introduction to the Solar System._
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