How Are Planets Made? NASA's James Webb Space Telescope Makes Breakthrough Discovery

Since Webb observed cold water vapour, the theory that the drifting of icy pebbles towards the warmer zone in protoplanetary disks produces planets is confirmed. 

Webb observed water vapour in protoplanetary disks, which are rotating disks of dense gas surrounding young newly formed stars, and eventually develop into planets. Observing the water vapour helped Webb confirm a physical process involving the drifting of ice pebbles.

Source : NASA/ESA/CSA

NASA's James Webb Space Telescope (Webb) has made a breakthrough discovery on how planets are made. Webb observed water vapour in protoplanetary disks, which are rotating circumstellar disks of dense gas surrounding young newly formed stars, and eventually develop into planets and asteroids. Observing the water vapour helped Webb confirm a physical process involving the drifting of ice-coated solids from the outer regions of the disk into the inner rocky-planet zone.  Icy pebbles forming