Elementary particles may exhibit an effect of gravitational forces.
A state of gravitational collapse may be knowned as a black hole.
A gravitational field of a (neutron star) may distort layers of a (companion star).
An envelope may fall through a gravitational field of a (neutron star).
A core may collapse under a gravitational attraction of a matter.
An orbit may be pulled into a shape by a gravitational attraction to moons.
A gravitational potential energy may be transformed to kinetic energy.