Astronomers were surprised to find so many Jupiter-mass planets so close to their stars. According to their best theories and models, such "hot Jupiters"

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According to the best theories and models, "hot Jupiters" must have formed further out from the star and migrated inward early on in the planet's formation. This is supported by observations of other planets in the same systems, which can show evidence of interactions with their "hot Jupiter" neighbor. Capturing a planet from a passing star or the planet falling into the star would be less likely scenarios.

Astronomers Were Surprised to Find So Many Jupiter-Mass Planets So