The tidal interaction between the star and planets functions as a braking system that likely forces the TRAPPIST-1 planets to become tidally locked.

“what's happening is as the star as the planet is rotating round its it has a slight tidal bulge from the from the gravity of the star so the gravity that starts kind of making it's like a squash ball it's squashing the planets down into these little ellipsoids and as it rotates yeah same thing as it”