astroengine writes: "As a vast cloud of gas collapses under its mutual gravity and seeds the birth of a young star, the process of planetary formation begins. But far from it being a neat and tidy formation process, astronomers have uncovered a mechanism that determines why some orbits around the new star may be devoid of planets, whereas others become jammed with planets. And it all begins when the star system is very young — stellar radiation kickstarts a mechanism called photoevaporation, carving out cavities in the protoplanetary disk that can trap gas giant planets as the migrate closer to their parent star."
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