Tidal forces

situation in which an astronomical object's orbital period matches its rotational period

astronomical concept

secondary effect of the force of gravity of one body on another

French astronomer (1820-1883)

alt=|thumb|Astronaut falling into a black hole (schematic illustration of the spaghettification effect) thumb|upright=1.3|Tidal forces acting on a spherical body in a non-homogeneous [[gravitational field. In this diagram, the gravitational force originates from a source to the right. It shows both the tidal field (thick red arrows) and the gravity field (thin blue arrows) exerted on the body's surface and center (label O) by a source (label S).]]

cause of tidal locking

thermal effect of tidal deformation

hypothetical type of tidally locked planet with spatial features resembling an eyeball