gravity well!

gravity well

Comprehensive Analysis

1) "Gravity" -- As to gravity well grav·i·ty Pronunciation: 'gra-v&-tE Function: noun Inflected Form(s): plural -ties Usage: often attributive Etymology: Middle French or Latin; Middle French gravité, from Latin gravitat-, gravitas, from gravis 1 a : dignity or sobriety of bearing b : IMPORTANCE, SIGNIFICANCE; especially : SERIOUSNESS c : a serious situation or problem 2 : WEIGHT 3 a (1) : the gravitational attraction of the mass of the earth, the moon, or a planet for bodies at or near its surface (2) : a fundamental physical force that is responsible for interactions which occur because of mass between particles, between aggregations of matter (as stars and planets), and between particles (as photons) and aggregations of matter, that is 1039 times weaker than the strong force, and that extends over infinite distances but is dominant over macroscopic distances especially between aggregations of matter -- called also gravitation, gravitational force -- compare ELECTROMAGNETISM 2a, STRONG FORCE, WEAK FORCE b : ACCELERATION OF GRAVITY c : SPECIFIC GRAVITY Pronunciation Symbols Gravitation is a phenomenon through which all objects attract each other. Modern physics describes gravitation using the general theory of relativity, but the much simpler Newton's law of universal gravitation provides an excellent approximation in many cases. Gravitation is the reason for the very existence of the Earth, the Sun, and every object in the universe; without it, matter would not have coalesced into masses and life would not exist. Gravitation is also responsible for keeping the Earth and the other planets in their orbits around the Sun; the Moon in its orbit around the Earth; the formation of tides; and various other natural phenomena that we observe. The gravitational force keeps the planets in orbit about the Sun. 1 History of gravitational theory 1.1 Early history 1.2 Newton's theory of gravitation 1.3 General relativity 2 Specifics 2.1 Earth's gravity 2.2 Equations for a falling body 2.3 Gravity and astronomy 2.4 Gravity versus gravitation 3 Alternative theories 4 See also 5 Notes 6 References 7 External links Since the time of the Greek philosopher Aristotle in the 4th century BC, there have been many attempts to understand and explain gravity. Aristotle believed that there was no effect without a cause, and therefore no motion without a force. He hypothesized that everything tried to move towards its proper place in the crystalline spheres of the heavens, and that physical bodies fell toward the center of the Earth in proportion to their weight. Another early explanation was that of the Indian astronomer Brahmagupta who, in his Brahmasphuta Siddhanta (628 CE), respon..." 2) "Well" -- As to gravity well 1well Pronunciation: 'wel Function: noun Etymology: Middle English welle, from Old English; akin to Old English weallan to bubble, boil, Old High German wella wave, Lithuanian vilnis 1 a : an issue of water from the earth : a pool fed by a spring b : SOURCE, ORIGIN 2 a : a pit or hole sunk into the earth to reach a supply of water b : a shaft or hole sunk to obtain oil, brine, or gas 3 a : an enclosure in the middle of a ship's hold to protect from damage and facilitate the inspection of the pumps b : a compartment in the hold of a fishing boat in which fish are kept alive 4 : an open space extending vertically through floors of a structure 5 : a space having a construction or shape suggesting a well for water 6 a : something resembling a well in being damp, cool, deep, or dark b : a deep vertical hole c : a source from which something may be drawn as needed 7 : a pronounced minimum of a variable in physics <a potential well> Pronunciation Symbols Well is an English adverb with irregular comparison. Well may also refer to: Water well, an artificial excavation or structure for the purpose of withdrawing water Oil well, a hole drilled through the Earth's surface for the purpose of extracting petroleum oil Gas well, a relatively minor variation on an oil well The WELL, originally Whole Earth 'Lectronic Link, a virtual community Well (play), a play by Lisa Kron Well (novel), a novel by Matthew McIntosh Well, Hampshire Well, Lincolnshire Well (Gelderland) Well, Limburg Well, North Yorkshire Well, Somerset "The Well", a nickname for the Scottish football team, Motherwell F.C. Potential well Well-to-wheel. "Well", a song by Captain Beefheart from his 1969 album Trout Mask Replica Wells (disambiguation) ..." 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