Physical Characteristics
It had been previously hypothesized that hot Jupiters particularly close to their parent star should exhibit this kind of inflation due to intense heating of their outer atmosphere. Tidal heating due to its orbit's eccentricity, which may have been more eccentric at formation, may also have played a role over the past billion years.
Read more about this topic: HD 209458 B
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“Patience, that blending of moral courage with physical timidity.”
—Thomas Hardy (1840–1928)