GRE Reading Comprehension: Maggoosh-GRE阅读Maggoosh - UX5B5BRPT35555EPN

Jupiter has 2.5 times more mass than all the other planets of the solar system combined and is 11 times as large as Earth in diameter. Jupiter is so large that scientists believe it almost became a star: as the gases and dust contracted to form the planet, gravitational forces created tremendous pressure and temperature inside the core – as high as tens of thousands of degrees. But there was not enough mass available to create the temperature needed to start a fusion reaction such as that of the Sun (above 27,000,000 Fahrenheit, or 15,000,000 Celsius, at the Sun's core); thus Jupiter has been cooling down ever since. Even so, Jupiter radiates about as much heat as it receives from the Sun.