Webb, gezegenleri parçalayan çarpışmaların bıraktığı tozu okuyor

Astronomers have used the James Webb Space Telescope to examine 21 extreme debris disks, young stellar systems containing unusually large amounts of warm dust near the region where rocky planets form. Webb and archived Spitzer observations showed that these rare disks share small dust grains, concentrated warmth and irregular changes in infrared brightness. Their mineral composition divided them into two groups. About one third were rich in silica, which suggests energetic impacts between Mars-sized bodies capable of vaporising substantial amounts of rock. The remaining disks were silica-poor and probably resulted from gentler, grazing collisions between Moon-sized objects. Silica-rich systems appeared only around stars younger than 300 million years, matching the period when simulations predict terrestrial planets should assemble. By connecting particular minerals with collision scale and system age, researchers can investigate planetary embryos that are too small to observe directly and compare distant upheavals with the events that shaped Earth and the Moon.