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In the nineteenth century, some scientists thought there was a planet even closer to the Sun than Mercury, which they called Vulcan (no relation to the fictional planet Vulcan in Star Trek). Further discoveries showed this planet did not exist, but if there were a planet that close to the Sun, which of the following would definitely be true?

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In the nineteenth century, some scientists thought there was a planet even closer to the Sun than Mercury, which they called Vulcan (no relation to the fictional planet Vulcan in <i>Star Trek</i>). Further discoveries showed this planet did not exist, but if there were a planet that close to the Sun, which of the following would definitely be true?






 
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