Gravity

thumb|upright=1.35|The shapes of two massive galaxies in this image evolved under the effects of gravity.

right|thumb|Variation of orbital eccentricity    

thumb|upright=1.4|Badlands incised into [[shale at the foot of the North Caineville Plateau, Utah, within the pass carved by the Fremont River and known as the Blue Gate. G. K. Gilbert studied the landscapes of this area in great detail, forming the observational foundation for many of his studies on geomorphology.]] thumb|Surface of Earth, showing higher elevations in red

physical constant relating the gravitational force between objects to their mass and distance

acceleration of an object caused by gravity

thumb|upright=1.3|A wormhole visualized as a two-dimensional surface. Route (a) is the shortest path through normal space between points 1 and 2; route (b) is a shorter path through a wormhole.

motion of a body where its weight is the only force acting upon it; any motion of a body where gravity is the only force acting upon it

hypothetical region of spacetime that serves as the opposite of a black hole

thumb|upright=1.35|Astronauts on the International Space Station experience only microgravity and thus display an example of weightlessness. [[Michael Foale can be seen exercising in the foreground.]]

astronomical concept

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

acceleration that the Earth imparts to objects on or near its surface

physical process by which an object is held aloft, without mechanical support, in a stable position

scalar potential that describes a gravitational field

Teardrop-shaped spacetime distortion near binary stars

inertial force that mimics the effects of gravity, usually by rotation

gravity experiment

type of potential energy

environment with extremely low apparent gravitational force

standard surface gravity

problem of predicting the individual motions of a group of celestial objects interacting with each other gravitationally

standard gravitational acceleration on Earth's surface

type of astronomy involving observation of gravitational waves

unusual or hypothetical physical substance or state

A quadrupole or quadrapole is one of a sequence of configurations of things like electric charge or current, magnetic fields, or gravitational mass that can exist in ideal form, but it is usually just part of a multipole expansion of a more complex structure reflecting various orders of complexity.

non-technical introduction to the theory of gravity by Albert Einstein

hypothetical type of exotic matter whose mass is of opposite sign to the mass of normal matter

parody of intelligent design

branch of astrophysics that statistically models the collective movement of stars

famous phrase used by Isaac Newton in one of his essays

experiment to determine the mean density of the Earth

Action that yields the Einstein field equations through the principle of least action

Simplified gravity models for objects inside or outside a spherically symmetrical body

minimum energy to remove a system from a gravitationally bound state

type of train

mathematical description of a body in free fall

unexplained observed excessive energy during Earth flybys of spacecraft

theoretical description of motion of Earth's moon

nonlinear modification of the Schrödinger equation

simulation of a dynamical system of particles

gravitational force exerted by the planet Mars

approximation algorithm for performing an n-body simulation

study of the physical properties of the Earth's gravity field as part of Higher Geodesy

Study of the effects gravity has on living organisms

thumb|A self-gravitating accretion disc in a quasi steady state Self-gravity is gravitational force exerted by a system, particularly a celestial body or system of bodies, onto itself. At a sufficient mass, this allows the system to hold itself together. The effects of self-gravity have significance in the fields of astronomy, physics, seismology, geology, and oceanography.

shell bounded by two concentric, similar ellipses or ellipsoids

Lorentzian metric describing an isotropic, expanding, nonhomogenous universe

particular set of coordinates for the Schwarzschild metric

thumb|Michael Collins (astronaut)|Michael Collins during centrifuge training Hypergravity is defined as the condition where the force of gravity (real or perceived) exceeds that on the surface of the Earth. This is expressed as being greater than 1 g. Hypergravity conditions are created on Earth for research on human physiology in aerial combat and space flight, as well as testing of materials and equipment for space missions. Manufacturing of titanium aluminide turbine blades in 20 g is being explored by researchers at the European Space Agency (ESA) via an 8-meter wide Large Diamet

Physical theorem

Metric in relativity