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The largest planet ever discovered is also one of the strangest, and theoretically should not even exist, scientists say. Dubbed TrES-4, the planet is about 1.7 times the size of Jupiter and belongs to a small subclass of "puffy" planets that have extremely low densities. "TrES-4 is way bigger than it's supposed to be," Mandushev told SPACE.com. "For its mass, it should be much smaller. It basically should be about the size of Jupiter, and instead it's almost twice as big."
The parent star of TrES-4 is also unusual in that it is about the same age as our sun, but much farther along in its evolutionary history.
"Because it is more massive, it has evolved much faster," Mandushev explained. "It has become what astronomers call a subgiant, or a star that has exhausted all of its hydrogen fuel in the core and is on its way to becoming a red giant."