TrES-4b (also called TrES-4) is an exoplanet. It orbits around the star GSC 02620-00648. The planet is 4.5 million miles from its sun. Being this close to its sun, the year on TrES-4b about three days long. This makes the temperature on the planet very hot. In fact, the temperature on TrES-4b is about 2,300 degrees Fahrenheit (1,260 degrees Celsius).
TrES-4b is a gas giant that is 70 percent bigger than Jupiter. However, the planet is only as dense as cork. At the time of its discovery, TrES-4b was the largest known planet in the universe.
TrES-4b was discovered using the transit method. When an exoplanet passes between its sun and the Earth, astronomers can see a change in light from the star.
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