Ice giants have been discovered orbiting very close to their parent stars. How is this possible?
A. Ice giants may have formed farther from their star, but migrated inward.
B. The star may have captured a passing planet.
C. The stars are relatively cool, allowing ice giants to form close to them.
D. The gravitational force of massive stars can pull icy planetesimals inward from the outer parts of the system.
E. All of these choices are correct.
Answer: A
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