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Are there any known planets that are bigger than our sun?

Answer 1

With a diameter just over twice that of Jupiter, KOI-13b is most likely the largest planet currently known to science.

WASP-17b, which has a diameter slightly less than twice that of Jupiter, held the previous record.

HAT-P-32b, which has a diameter 2.037 times that of Jupiter, is a potential larger planet; however, it might be a brown dwarf.

Since Jupiter has a diameter about #1/10# of the sun, that means that the largest planets we have found have diameter about #1/5# of that of the sun.

Basically, gas giants undergo fusion reactions and eventually become brown dwarf stars beyond a certain mass. It's important to note that I say mass, not diameter. As mass increases, so does density, and smaller brown dwarfs are typically about the size of Jupiter.

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Answer 2

Claire Anctil

The Sun is a star, and planets orbit stars, so planets are much smaller in size than stars. Therefore, no planet is known to be larger than the Sun.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.