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How big is the biggest planet in the universe?

Answer 1

Take all the other planets, dwarf planets, asteroids, moons and comets in the solar system and put them together and Jupiter is about twice that size.

Jupiter is so massive that it emits heat; to be the size of the smallest red dwarf, it would have to be roughly three times larger than it is, but even so, it is producing more heat than it is taking in from the sun.

Seventy percent larger than Jupiter is the largest known planet ever found in the Universe.

Findings from Discovery Tres 4: A New Extrasolar Planet in the Hercules Constellation

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Answer 2

Asher Cohen

Although the size of the largest planet in the universe is unknown, TrES-4b, a gas giant with a radius roughly 1.7 times that of Jupiter, is thought to be the largest planet in our observable universe.

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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.