reverse search

Dictionary Suite
black hole a hypothetical region or body in space, possibly the remnants of a collapsed star, with such a strong gravitational pull that neither light nor matter can escape.
field in physics, an area in which a gravitational, electric, or magnetic force occurs. [1/11 definitions]
force of nature in physics, any one of the fundamental forces that occur in nature, including electromagnetic force, weak nuclear force, strong nuclear force, and gravitational force. [1/3 definitions]
free-fall the unconstrained fall of a body within a gravitational field. [1/2 definitions]
geotaxis the movement of a freely moving organism toward or against gravitational pull.
gravimeter an extremely sensitive device for measuring variations in the gravitational field of the earth or the moon. [1/2 definitions]
graviton in physics, a theoretical particle that acts as the unit of gravitational energy.
gravity gravitational attraction or movement. [1/4 definitions]
lunisolar involving the combined gravitational force of the moon and sun.
neutron star an extremely dense star, composed mostly of neutrons, with very powerful gravitational attraction.
nongravitational combined form of gravitational.
precession of the equinoxes the earlier occurrence of the equinoxes in each sidereal year because of a slow variation in the rotation of the earth, caused by the gravitational pull of the sun and moon.
Roche limit the lowest altitude at which a natural satellite can form and orbit a planet or the like without being disturbed by gravitational forces.
sphere of influence in astronomy, the region around a celestial body within which the primary gravitational force on an orbiting object is that body. [1/3 definitions]
swing-by the use of a planet's gravitational pull to facilitate a change in flight direction during space travel.
syzygy in astronomy, the alignment, either in conjunction or opposition, of three celestial bodies within the same gravitational system, esp. the sun, moon, and earth. [1/3 definitions]
tide the periodic change, occurring about every twelve hours, in the height of the surface of oceans and nearby bodies of water, or a specific instance of this change. Tides are caused by the gravitational pull of the moon and sun. [1/6 definitions]