Gravity is a law of nature where all objects of mass attract each other. Gravity holds the planets of star systems together and basically holds the whole universe together.
Sir Isaac Newton developed the theory of gravity. The Doctor once claimed that he sat in Newton's tree dropping apples onto his head, then explained gravity to him over dinner. (DW: The Pirate Planet)
In the year 100,000,000,000,000 when all the stars had burned out, planets were found through a graviational field navigational system. (DW: Utopia)
During a crisis in midflight, the TARDIS locks onto the nearest place of gravity and lands there. (DW: Voyage of the Damned)
Most spaceships have artificial gravity systems. There have also been attempts to control or manipulate gravity on a larger scale.
The Gravitron was installed in the moonbase in the year 2050. By using it to alter the Earth's tides, people were able to control the Earth's weather. In 2070 the Cybermen attempted to take over the Gravitron as part of their invasion of Earth. (DW: The Moonbase)
The Tractators were a insect-like race that could control gravity with their minds (DW: Frontios)
Gravity, or gravitation, is the natural phenomenon by which objects with mass attract other objects with mass. In common usage, gravity is considered the force which and object weight.
The elemental particle which conveys gravity is the graviton. By manipulating gravitons, artificial gravity fields can be generated. Similar manipulation can counteract natural gravitational fields; this is commonly referred to as anti-gravity technology.
Gravity is a state inflicted by some spells. It has the following effects:
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Gravity is a phenomenon involving the mutual attraction of objects with mass. Antigravity is the negation of that force.
A flying belt found inside a Slaver stasis box held the secret of antigravity. (TAS: "The Slaver Weapon")
In July, 1976, the Apollo 22 mission was launched around the same time as the Viking probes to Mars. It was not revealed to the general public that a Slaver stasis box was discovered, containing a flying belt. Years later, the secret of synthetically generated gravity is derived from this discovery. (Star Trek: Shadowstar Station)
Gravity article at Memory Alpha, the canon Star Trek wiki.
Gravity is the attraction between two bodies, dependent on their masses and the distance between them.
Along with the Force, gravity bound things together. At times, gravity could become a nuisance, usually to those attempting to forge hyperlanes in areas of tightly packed star formation, making them unstable. Gravity was also needed for anti-gravity repulsorlifts to properly work in an atmosphere. Without an opposing force to push against, repulsorcraft could not work.
Most inhabited planets and moons in the galaxy had an acceleration of gravity at or near standard gravity of 9.81 m/s².
Starships utilized artificial gravity generators to simulate gravity in outer space.
Gravity was responsible for helping Obi-Wan Kenobi find the missing planet of Kamino, as all nearby objects were drawn towards the spot where Kamino was supposed to be, though nothing was recorded in the Jedi Archives at those coordinates.
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