When astronomers began searching for extrasolar planets, they were surprised to discover Jupiter-sized planets much closer than 1 AU from their parent stars. Why is this surprising?
a) These planets must have formed at larger radii where temperatures were cooler and then migrated inward.
b) Jupiter-sized, rocky planets were thought to be uncommon in other solar systems.
c) These planets must be the remnants of failed stars.
d) Earth-like planets must be rarer than Jupiter-sized planets in other solar systems.
e) It is different than in our Solar System.
Answer: a) These planets must have formed at larger radii where temperatures were cooler and then migrated inward.
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