Young extrasolar gas giant. Artwork of a gas giant planet (right), two of its moons (lower left), and its parent star (upper left) in a 10 million years old star system. Traces of gas (white) are still visible in this relatively young system. The star will burn for billions of years. It is thought that gas giant planets form early on (in the first 10 million years) in the history of a star system, or not at all. This theory was proposed following an infrared survey made with the Spitzer Space Telescope (SST).