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Topic: Gravity

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Orbit

Generalized Theory of Gravitation

Gravitational constant

Classical tests of general relativity

Weight

Albert Einstein

Celestial mechanics

Mathematics of general relativity

Dynamic theory of gravity

Gravitational radiation

General relativity

Gee

Fundamental interaction

Equivalence principle

In the News (Sat 21 Nov 09)

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	MicroPlanet Gravity Usenet News Reader
		Gravity is a full featured Windows Usenet online/offline news client with an extensive feature list.
		Gravity originally started as shareware, and later as freeware.
		If you are a current Gravity user you should be aware that the open source version is stripped down from the earlier releases (Build 2057 and lower).
	mpgravity.sourceforge.net (714 words)

	Cassini-Huygens: Operations-Gravity Assists
		Gravity assist works because of the mutual gravitational pull between a moving planet and a spacecraft.
		One last gravity assist from Jupiter on December 30, 2000 gave Cassini-Huygens the final thrust of energy it needed to project itself all the way to Saturn.
		Gravity assist has often been called the "slingshot effect," but in reality, it is a different example altogether.
	saturn.jpl.nasa.gov /mission/gravity-assists.cfm (463 words)

	SPACE.com -- Speed of Gravity Measured for First Time
		SEATTLE - The first accurate measurement ever taken of the speed with which gravity propagates shows that it is equal to the speed of light, agreeing nicely with the General Theory of Relativity.
		That gravity works instantaneously is almost impossible, according to the study.
		Craig Hogan, an astronomer and physicist at the University of Washington, was not involved in the new research.
	www.space.com /scienceastronomy/gravity_speed_030107.html (612 words)

	Gravity
		Since the Earth’s gravity pulls all objects toward the center of its MASS, and since gravity is a product of MASS, clearly MASS is the guilty party and it is merely an unfortunate coincidence that the plaintiff happened to get in the way.
		Back on Earth this relationship between velocity and gravity is inescapably unbalanced; the same stuff that danced about the cabin so elegantly in orbit drops boorishly to the floor as it is accelerated toward the center of Earth's great mass.
		The attractive force of Earth's gravity, which happens to be an acceleration of 32 feet per second for each second of freefall, is equally imposed and obeyed by all.
	www.christa.org /gravity.htm (2483 words)

	Gravity Concepts and Applications
		Gravity is the weakest of the four fundamental forces, yet it is the dominant force in the universe for shaping the large scale structure of galaxies, stars, etc. The gravitational force between two masses m
		The gravity force has the same form as Coulomb's law for the forces between electric charges, i.e., it is an inverse square law force which depends upon the product of the two interacting sources.
		As shown in the illustration of a horizontal launch, gravity acts the same way on both bullets, giving them the same downward acceleration and making them strike the ground at the same time if the bullet is fired horizontally over level ground.
	hyperphysics.phy-astr.gsu.edu /hbase/grav.html (479 words)

	Gravity
		To be in free fall, gravity has to be the only force acting on the objects.
		This is because of weight, the force of gravity on an object at the surface of the planet.
		The reason is the force of the gravity also depends on the distance between the objects.
	library.thinkquest.org /CR0215468/gravity.htm (787 words)

	The Speed of Gravity - What the Experiments Say
		This is because gravity, in contrast to light, has no detectable aberration or propagation delay for its action, even for cases (such as binary pulsars) where sources of gravity accelerate significantly during the light time from source to target.
		If gravity were a simple force that propagated outward from the Sun at the speed of light, as radiation pressure does, its mostly radial effect would also have a small transverse component because of the motion of the target.
		If possible waves associated with sources of gravity (those that may induce acceleration in other bodies), and other possible waves induced by targets of gravity (those that result from acceleration), are not distinguished, we are certain to have massive confusion over the meaning of the very concept of “the speed of gravity”.
	metaresearch.org /cosmology/speed_of_gravity.asp (8709 words)

	Gravity (Site not responding. Last check: )
		Gravity is as easy (or complex) to define as you want it to be.
		You can choose to ignore the elements of Gravity, accepting things as they are (or seem to be), or you can take a long deep breath, blink a couple of times and then purposefully gain control over Gravity.
		When Gravity starts causing things to "fall in your favor," you will be privileged to see that beyond the tangible aspects of life that we can all taste, feel, see, smell and touch, there are thought streams you can tap into.
	www.alvernaz.com /Personal/Gravity/gravity.html (2839 words)

	The Force of Gravity - School for Champions: Succeed in Physical Science
		The force of gravity from the Earth on an object is the acceleration of gravity times the mass of the object.
		One surprising characteristic of the force of gravity is that the acceleration it causes in falling bodies is independent of the mass of the object.
		Not only does is the acceleration of gravity independent of the mass of an object, but it is also independent of the velocity of the object parallel to the ground.
	www.school-for-champions.com /science/gravity.htm (1539 words)

	gravity - Definitions from Dictionary.com
		At the atomic level, where masses are very small, the force of gravity is negligible, but for objects that have very large masses such as planets, stars, and galaxies, gravity is a predominant force, and it plays an important role in theories of the structure of the universe.
		Gravity is believed to be mediated by the graviton, although the graviton has yet to be isolated by experiment.
		Gravity is weaker than the strong force, the electromagnetic force, and the weak force.
	dictionary.reference.com /browse/gravity (832 words)

	Gravity
		Gravity is a force of attraction that exists between any two objects.
		There is a force of gravity between the sun and the Earth, between the Earth and us, and even between two marbles.
		Gravity is the weakest of the four known forces of nature, yet the most dominant force.
	www.stanford.edu /~buzzt/gravity.html (939 words)

	Warning: Gravity is "Only a Theory" by Ellery Schempp
		For example, “the moon goes around the earth.” If the theory of gravity were true, it would show that the sun's gravitational force on the moon is much stronger than the earth's gravitational force on the moon, so the moon would go around the sun.
		Moreover, if gravity were working on the early earth, then earth would have been bombarded out of existence by falling asteroids, meteors, comets, and other space junk.
		His dabbling in gravity, alchemy, and calculus was a mere sideline, perhaps an aberration best left forgotten in describing his career and faith in a Creator.
	www.bringyou.to /apologetics/p67.htm (1390 words)

	Gravity
		It is simply a religious belief that gravity is "universal." And gravitationalists are not attempting to remedy this lack of experiment evidence, afraid of failure, no doubt.
		If the theory of gravity were true, the sun's gravitational force on the moon would be much stronger than the earth's gravitational force on the moon.
		Gravity is irreducibly complex and could not have evolved without the hand of a designer.
	www.re-discovery.org /gravity_1.html (1727 words)

	Gravity - Memory Alpha, the Star Trek Wiki (Site not responding. Last check: )
		Gravity is one of the four main forces within the standard model of particle physics.
		It is the weakest of the four forces, but results in very large effects due to the high total amount of mass in the universe and the long range of the gravitational force.
		A quantum model of gravity has yet to be established, but it is theorized that the gravitational force is transmitted via a particle called the graviton.
	memory-alpha.org /en/wiki/Gravity (529 words)

	QUANTUM GRAVITY
		This involves the introduction of a new concept of time, which underpins and gives coherence to the discussion of gravity, and which is the principal tool that will enable us to unify the Theory of Relativity and Quantum Mechanics.
		The new Quantum Theory of Gravity explains why the star’s external layer of matter, responsible for its gravitational connection, is unable to withstand the internal pressure generated by the energy liberated by its nuclear reactions.
		Gravity and gravitational control have long been objects of study, alongside the constant search for ways to improve or replace traditional means of transport.
	www.geocities.com /rolfguthmann (794 words)

	The Mystery of Gravity.
		Gravity is an always-attractive force that acts between particles of matter.
		Perhaps the most unusual thing about gravity we know about is that, unlike the other forces of nature, gravity is intimately related to space and time.
		Gravity does not exist like the frosting on a cake, embedded in some larger arena of space and time.
	www.astronomycafe.net /gravity/gravity.html (1349 words)

	Gravity Assisted Mountain Biking - all about mountain bike rides, bike races, cycle touring and more
		Gravity didn't ride during the two month rainy season, and instead used that time to completely overhaul our fleet of Kona mountain bikes, travel around and re-charge our batteries for the 2007 season.
		Gravity is proud to be both an official Kona Ride Center ("Groove approved") and the distributor for Kona mountain bikes in Bolivia.
		Gravity is proud to be the distributor for Hayes Disc Brakes in Bolivia.
	www.gravitybolivia.com (2626 words)

	Taming Gravity - Popular Mechanics
		Ever since electricity was tamed in the 19th century, the idea of manipulating gravity by altering an electromagnetic field has been the subject of intriguing experiments and occasional bursts of irrational exuberance.
		"It does not modify gravity, rather it produces a gravity-like field that may be either attractive or repulsive." Li describes her device as a method of generating a never-before-seen force field that acts on matter in a way that is similar to gravity.
		Since it may be either repulsive or attractive she calls it "AC gravity." "It adds to, or counteracts, or re-directs gravity," explains Larry Smalley, the former chairman of the University of Alabama at Huntsville (UAH) physics department.
	www.popularmechanics.com /science/research/1281736.html (1431 words)

	Gravity
		Gravity is the weakest of the four universal forces which also include nuclear force, weak radiation force, and electromagnetism.
		Gravity is the force exerted by any object with mass on any other object with mass.
		Gravity is ubiquitous, omnipresent and causes objects to accelerate towards the centers of other objects exerting gravitational attraction (like the center of the Earth).
	www.nas.nasa.gov /About/Education/SpaceSettlement/teacher/lessons/bryan/microgravity/gravback.html (476 words)

	Gravity
		The Speed of Gravity - What the Experiments Say discusses all the experimental evidence that bears on the intriguing question of the speed of gravity, concluding that it must be many orders of magnitude faster than light in forward time (i.e., no causality violations).
		Discussion of the first "speed of gravity" paper led to a follow-up paper to answer questions and issues raised by the community of relativists in response to the first paper.
		Readers of Pushing Gravity may be interested in a supplement to the chapters by Tom Van Flandern and Victor Slabinski: The Meta Cycle.
	www.metaresearch.org /cosmology/gravity/gravity.asp (691 words)

	Evangelical Scientists Refute Gravity With New 'Intelligent Falling' Theory \| The Onion - America's Finest News Source
		Scientists from the Evangelical Center For Faith-Based Reasoning are now asserting that the long-held "theory of gravity" is flawed, and they have responded to it with a new theory of Intelligent Falling.
		Proponents of Intelligent Falling assert that the different theories used by secular physicists to explain gravity are not internally consistent.
		Critics of Intelligent Falling point out that gravity is a provable law based on empirical observations of natural phenomena.
	www.theonion.com /content/node/39512 (823 words)

	Gravity
		Gravity is a force of attraction only between bodies that have mass.
		From this an important equation for finding the force of gravity on an object e.g.
		Please note: Gravity is measured in Newtons(N) or kg ms-1.
	www.angelfire.com /geek/alphabeta (146 words)

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