(astronomy) The action of a highly-massive object (such as a star, galaxy, or black hole) that acts as a gravitational lens and focuses light from a light source (such as another star or galaxy) that passes behind it as observed from the Earth.

(physics) The convection (carriage) of contents of a fluid, such as mass or heat, by means of currents induced in the fluid by buoyancy forces which are dependent on gravity acting upon density differences within the fluid.

(physics) A very long-range, but relatively weak fundamental force of attraction that acts between all particles that have mass; believed to be mediated by gravitons.

(physics) The fundamental interaction responsible for the gravitational force.

(physics) the field produced by the gravitational force of mass

Any supposed method of propulsion that warps space or spacetime or interacts in some way with warped space or spacetime.

(physics) a hypothetical wave, produced by an accelerating mass, that would be propagated at the speed of light

(astronomy) A massive body that produces distorted, magnified or multiple images of more distant objects when its gravitational field bends the path of light rays.

The stage in the evolution of a star in which the pressure of the star is insufficient to maintain it at a stable size, and its material falls inward under its own gravitational attraction, eventually forming a black hole or a neutron star, and sometimes accompanied by a supernova explosion.

(astronomy, physics) A shift to longer wavelengths of spectral lines emitted by atoms in a strong gravitational field.