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Topic: Tidal locking

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	Tidal locking - Wikipedia, the free encyclopedia
		Tidal locking is a purely gravitational effect, and does not require the bodies to be planets and moons.
		The tidal locking situation for asteroid moons is largely unknown, but closely-orbiting binaries are expected to be tidally locked, as well as, obviously, contact binaries.
		Close binary stars throughout the universe are expected to be tidally locked with each other, and extrasolar planets that have been found to orbit their primaries extremely closely are also thought to be tidally locked to them.
	en.wikipedia.org /wiki/Tidal_locking (1188 words)

	Tidal force - Wikipedia, the free encyclopedia
		The tidal force is a secondary effect of the force of gravity and is responsible for the tides.
		Tidal effects become particularly pronounced near small bodies of high mass, such as neutron stars or fl holes, where they are responsible for the "spaghettification" of infalling matter.
		Tidal forces, in combination with centripetal forces, create the oceanic tide of Earth's oceans, where the attracting bodies are the Moon and the Sun.
	en.wikipedia.org /wiki/tidal_force (871 words)

	Learn more about Tidal force in the online encyclopedia. (Site not responding. Last check: 2007-11-07)
		Tidal force is a secondary effect of the force of gravity.
		Tidal effects become particularly pronounced near small bodies of high mass, such as neutron stars or fl holes.
		Tidal forces are also responsible for the oceanic tides, where the large body is the water in Earth's oceans, and the attracting bodies are the Moon and the Sun.
	www.onlineencyclopedia.org /t/ti/tidal_force.html (294 words)

	Tidal locking (Site not responding. Last check: 2007-11-07)
		Close binary star s throughout the universe are expected to be tidally locked with each other, and extrasolar planet s that have been found to orbit their primaries extremely closely are also thought to be tidally locked to them.
		Energy from land tidal force The tidal activity in land is much smaller than that of in the sea because of its less flexibility and high density.
		Tidal Hydroelectric Power Describes a hybrid tidal electric plant, utilizing electrode-less electrolysis to produce hydrogen as a second fuel for the plant.
	www.serebella.com /encyclopedia/article-Tidal_locking.html (1241 words)

	[No title] (Site not responding. Last check: 2007-11-07)
		It was formerly thought that Mercury was tidally locked with the Sun, rotating once for each orbit and keeping the same face directed towards the Sun at all times, in the same way that the same side of the Moon always faces the Earth.
		Most moons in the solar system are tidally locked to their primaries, meaning that one side of the moon is always turned toward the planet.
		Tidal locking involves gravitational attraction between two bodies produces a tidal force on each of them, stretching each body along the axis oriented towards its partner and compressing it along the other two perpendicular axes.
	www.worldhistory.com /wiki/t/tidal-locking.htm (759 words)

	Tidal locking (Site not responding. Last check: 2007-11-07)
		Almost all moons in the solar system are tidally locked with theirprimaries, since they orbit very closely and tidal force increases rapidly with decreasing distance.
		More subtly, the planet Venus istidally locked with the planet Earth, so that whenever the two are at their closestapproach to each other in their orbits Venus always has the same face towards Earth.
		Close binary stars throughout the universe are expected to be tidally locked with each other, and extrasolar planets that have been found to orbit their primariesextremely closely are also thought to be tidally locked to them.
	www.therfcc.org /tidal-locking-20512.html (651 words)

	NationMaster.com - Encyclopedia: Tidal locking (Site not responding. Last check: 2007-11-07)
		The tide is the cyclic rising and falling of Earths ocean surface caused by the tidal forces of the Moon and the Sun acting on the Earth.
		Tidal effects become particularly pronounced near small bodies of high mass, such as neutron_stars or fl_holes, where they are responsible for the "spaghettification" of infalling matter.
		Tidal forces, including the additional term explained in the next section, are also responsible for the oceanic tides, where the reference body is the Earth with the water in its oceans, and the attracting bodies are the Moon and the Sun.
	www.nationmaster.com /encyclopedia/tidal-locking (2091 words)

	Tidal locking: Encyclopedia topic (Site not responding. Last check: 2007-11-07)
		Tidal locking makes one side of an astronomical body always face another, like the Moon (Moon: Any natural satellite of a planet) facing the Earth (Earth: The 3rd planet from the sun; the planet on which we live).
		Gravitational attraction between two bodies produces a tidal force (tidal force: the tidal force is a secondary effect of the force of gravity and is responsible...
		Almost all moons in the solar system (solar system: The sun with the celestial bodies that revolve around it in its gravitational field) are tidally locked with their primaries, since they orbit very closely and tidal force increases rapidly with decreasing distance.
	www.absoluteastronomy.com /reference/tidal_locking (823 words)

	Tidal resonance - Wikipedia, the free encyclopedia
		In oceanography, tidal resonance occurs when the time it takes for a large wave to travel from the mouth of the bay to the opposite end, then reflect and travel back to the mouth of the bay, coincidentally matches the time from one high tide to the next.
		The result of this coincidence of timing is that the repeating wave is reinforced by the tidal rhythm, and consequently the world's highest tides are found in that bay.
		This concept of tidal resonance differs from another sort of resonance resulting from tides, called tidal locking, which causes a moon's rotational period to coincide with the period of its revolution around the planet that it orbits, so that one side of the moon always faces the planet.
	en.wikipedia.org /wiki/Tidal_resonance (172 words)

	Tidal locking - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-11-07)
		It results in the orbiting bodies synchronizing their rotation so that one side always faces its partner (or, alternately, places them in orbital resonance).
		This is most clearly seen on Earth by how the ocean tides rise and fall with the rising and setting of the Moon, but it occurs on all rotating orbiting bodies.
		More subtly, the planet Venus is tidally locked with the planet Earth, so that whenever the two are at their closest approach to each other in their orbits Venus always has the same face towards Earth.
	www.encyclopedia-online.info /Tidal_locking (687 words)

	Tidal locking (Site not responding. Last check: 2007-11-07)
		Almost all moons in the solar system are tidally locked with their primaries they orbit very closely and tidal force rapidly with decreasing distance.
		More subtly planet Venus is tidally locked with the planet Earth so that whenever the two are their closest approach to each other in orbits Venus always has the same face Earth.
		binary stars throughout the universe are expected to tidally locked with each other and extrasolar planets that have been found to orbit primaries extremely closely are also thought to tidally locked to them.
	www.freeglossary.com /Tidal_locking (1023 words)

	TIDES (Site not responding. Last check: 2007-11-07)
		For most their tidal forces are negligible on Earth, but the differential gravitational force of the Sun does influence our tides to some degree (the effect of the Sun on Earth tides is less than half that of the Moon).
		For example, as a consequence of tidal interactions with the Moon, the Earth is slowly decreasing its rotational period and eventually the Earth and Moon will have exactly the same rotational period, and these will also exactly equal the orbital period.
		This is called gravitational (or tidal) locking, because as the two objects revolve around their common center of mass each keeps the same side turned toward the other.
	www.d.umn.edu /~hmooers/astro/Tides.htm (1486 words)

	Why Doesn't the Moon Rotate?
		The Moon is tidally locked to the Earth.
		To further underscore the point that there are two tidal bulges, note that the gravitational gradient produces two high tides, one on the side being pulled more, and one one the side being pulled less (With low tides on the sides).
		The rotational inertia of the Moon and the tidal lock with the Earth is sufficiently stable to resist all but a massive and destructive impact.
	www.digipro.com /Trials/moon.html (1958 words)

	Curious About Astronomy: Is the Moon moving away from the Earth? When was this discovered? (Site not responding. Last check: 2007-11-07)
		We call the parts that stick out "tidal bulges." The actual solid body of the Earth is distorted a few centimeters, but the most noticable effect is the tides raised on the ocean.
		Tidal friction, caused by the movement of the tidal bulge around the Earth, takes energy out of the Earth and puts it into the Moon's orbit, making the Moon's orbit bigger (but, a bit pardoxically, the Moon actually moves slower!).
		This can be accomplished by examining the thickness of tidal deposits preserved in rocks, called tidal rhythmites, which can be billions of years old, although measurements only exist for rhythmites that are 900 million years old.
	curious.astro.cornell.edu /question.php?number=124 (927 words)

	Tidal locking - Memory Alpha
		In planetary science, tidal locking is a phenomenon whereby the rotation period of a body about its axis equals its orbital period.
		An example of a tidally locked planet is Dytallix B in orbit around Mira Antliae.
		Other tidally locked bodies are Daled IV, Europa, Ganymede, Luna and Remus.
	memory-alpha.org /en/wiki/Tidal_locking (214 words)

	Physics Help and Math Help - Physics Forums - View Single Post - The moons' spiraling oribts
		I don't believe that any of the planets experience a tidal force from the Sun large enough to cause tidal locking before the Sun dies, however.
		Tidal locking is a result of the tidal strains that one body exerts on another in a gravitationally bound system.
		In the case of two tidally locked bodies, the two bodies stretch each other out along the line connecting them, so they're rather egg-shaped.
	www.physicsforums.com /showpost.php?p=40527&postcount=2 (613 words)

	The moons' spiraling oribts
		It is a result of the tidal forces the earth exerts on the moon (of course, it could just be a huge coincidence, but what are the odds?).
		This is known as being in tidal lock.
		The tidal effect transfers angular momentum from the planet to the moon in every case, so that if the moon is in a contrarotational orbit it will slow down and lose altitude, while those in a corotational orbit will gain altitude.
	www.physicsforums.com /showthread.php?t=3150 (1808 words)

	GLG 130 Lecture 12 (Site not responding. Last check: 2007-11-07)
		A body that is tidally locked to its primary is said to be in a one to one spin orbit resonance, since the spin period and the orbital period are in a 1:1 ratio.
		Tidal interactions between a satellite and its primary also affect the spin of the primary.
		Note that the tidal interaction that affects the spin period of the primary also affects the orbital period of the moon.
	www.cita.utoronto.ca /~murray/GLG130/Lectures/Lecture_twelve.html (490 words)

	Notes from Under Sky (Site not responding. Last check: 2007-11-07)
		What happens is that the tidal bulges raised by the moon would be directly under the moon (and directly opposite it, on the other side of the earth), except that the earth rotates, and friction with the ocean floor carries the tidal bulges ahead of the moon.
		The earth would then be said to be "tidally locked" to the moon, and it would keep one face to the moon, just as the moon now keeps one face to the earth.
		The moon's tidal influence, as noticeable as it is, is still too slow to tidally lock the earth before the sun expands and toasts them both.
	astro.isi.edu /notes/tides.html (811 words)

	RedOrbit - Reference Library (Site not responding. Last check: 2007-11-07)
		As a result of tidal locking, the Earth's rotation is also gradually being slowed down by the Moon, and the Moon is slowly receding from the Earth as the Earth's rotational momentum is transferred to the Moon's orbital momentum.
		The gravitional attraction that the Moon exerts on the Earth is the cause of tides in the sea.
		Tidal flow is synchronised to the Moon's orbit around the Earth.
	www.redorbit.com /education/reference_library?article_id=150 (1437 words)

	Tides and Gravitational Locking
		We have introduced tides in our earlier discussion of the Moon's observational characteristics through the effect of the Moon on the Earth's oceans, but the effect is much more general, and has a number of important consequences.
		For example, we shall see that the tidal forces exerted by Jupiter on its moon Io are so large that the solid surface of Io is raised and lowered by hundreds of meters twice in each rotational period.
		In the simplest instance, the period of rotation for the two bodies and the orbital period eventually become exactly equal because of this tidal coupling (and as a result, the size of the orbit is changed in such a way as to conserve angular momentum for the entire system).
	csep10.phys.utk.edu /astr161/lect/moon/tidal.html (768 words)

	Tidal Locking (Site not responding. Last check: 2007-11-07)
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	www.wikiverse.org /tidal-locking (767 words)

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