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What is the biggest planet in the universe?

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As of 2015, the largest known planet in the universe is TrES-4, a gas giant that is approximately 1.7 times the diameter of Jupiter, but only approximately 92 percent as massive. Located 1,430 light-years from Earth, TrES-4 was discovered in 2007 in the Hercules constellation by the Trans-Atlantic Exoplanet Survey.

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Scientists have speculated that there are other, larger gas giants besides TrES-4, with the biggest capable of achieving a size 15 times that of Jupiter. The TrES-4 system consists of the planet TrES-4, star TrES-4 A and star TrES-4 C. The presence of two stars in the system makes it a binary system.

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