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	Terrestrial planet
		A terrestrial planet is a planet which is mostly composed of silicate rocks.
		Terrestrial planets are substantially different from gas giants, which may not have solid surfaces and are composed mostly of some combination of hydrogen, helium, and water -- existing in various physical states.
		Terrestrial planets all have roughly the same structure: a central metallic core, mostly iron, with a surrounding silicate mantle.
	www.ebroadcast.com.au /lookup/encyclopedia/te/Terrestrial_planets.html (191 words)

	terrestrial planet. The Columbia Encyclopedia, Sixth Edition. 2001-05
		the earth or a planet that resembles the earth in its physical characteristics.
		The terrestrial planets in the solar system are the earth, Mercury, Venus, and Mars; Pluto is sometimes also classified as a terrestrial planet.
		They are considerably denser than the Jovian planets, ranging from a specific gravity of 4 for Mars to 5.5 for the earth.
	www.bartleby.com /65/te/terrestr.html (142 words)

	Terrestrial planet - Biocrawler (Site not responding. Last check: 2007-10-13)
		A terrestrial planet or telluric planet is a planet which is primarily composed of silicate rocks.
		Terrestrial planets are substantially different from gas giants, which may not have solid surfaces and are composed mostly of some combination of hydrogen, helium, and water existing in various physical states.
		Three possible terrestrial planets have been discovered orbiting the stars Mu Arae, 55 Cancri and GJ 436.
	www.biocrawler.com /encyclopedia/Terrestrial_planet (261 words)

	terrestrial planet - HighBeam Encyclopedia
		terrestrial planet the earth or a planet that resembles the earth in its physical characteristics.
		The terrestrial planets in the solar system are the earth, Mercury, Venus, and Mars.
		A bibliography of Idaho freshwater and terrestrial mollusks.
	www.encyclopedia.com /doc/1E1-terrestr.html (356 words)

	Jet Propulsion Laboratory
		Terrestrial Planet Finder will take family portraits of stars and their orbiting planets and determine which planets may have the right chemistry to sustain life.
		One great challenge is how to detect planets against the blinding glare of their parent star, an effort that has been compared to trying to find a firefly in the glare of a searchlight.
		Terrestrial Planet Finder will reduce the glare of parent stars to see planetary systems up to 50 light-years away.
	www.jpl.nasa.gov /missions/proposed/tpf.html (296 words)

	planet. The Columbia Encyclopedia, Sixth Edition. 2001-05
		The term is sometimes used to include the asteroids (or minor planets) but excludes the other members of the solar system: comets and meteoroids (see meteor; see also planetary science and planetary system, as well as the table entitled Major Planets of the Solar System).
		The major planets are classified either as inferior, with an orbit between the sun and the orbit of Earth (Mercury and Venus), or as superior, with an orbit beyond that of Earth (Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto).
		In addition to the major planets, the telescope has revealed thousands of minor planets, or asteroids, which orbit the sun in a bandlike cluster between Mars and Jupiter; the largest of these, Ceres, was also the first discovered (1801).
	www.bartleby.com /65/pl/planet.html (911 words)

	Re: Is a 'terrestrial' planet's lifetime determined by it's mass?
		Planets are thought to form by a process of accretion from the nebula surrounding a proto-star.
		Terrestrial planets are composed of a combination of metals (iron and nickel especially) and silicate minerals.
		A planet cools as its primordial heat is dissipated to space, and as its complement of radiogenic elements decays.
	www.madsci.org /posts/archives/nov2000/973967684.As.r.html (1603 words)

	Terrestrial Planet Finder (TPF)
		Terrestrial Planet Finder comprises two complementary observatories: a visible-light coronagraph (above), to launch first, and a formation-flying infrared interferometer (below), to launch several years later
		Our understanding of the properties of terrestrial planets will be scientifically most valuable within a broader framework that includes the properties of all planetary system constituents, including both gas giant and terrestrial planets and debris disks.
		TPF's ability to carry out a program of comparative planet studies across a range of planetary masses and orbital locations in a large number of new solar systems is by itself an important scientific motivation for the mission.
	www.daviddarling.info /encyclopedia/T/TPF.html (462 words)

	Terrestrial planet
		A terrestrial planet is a planet which is primarily composed of silicate rockss.
		Terrestrial planets are substantially different from gas giants, which may not have solid surfaces and are composed mostly of some combination of hydrogen, helium, and water existing in various physical statess.
		One suspected terrestrial planet has been discovered orbiting Mu Arae.
	www.xasa.com /wiki/en/wikipedia/t/te/terrestrial_planet.html (297 words)

	Paradoxes Resolved, Origins Illuminated - Gaseous Planet X?
		Before the planet cools, the H and He molecules have a rather high mean molecular speed.
		But if the planet has a small total mass, escape velocity will be smaller than the mean speed of the lightest molecules.
		These are in the inner transition zone where larger terrestrial planets can form because their original high temperatures assures the escape of more hydrogen and helium right at the outset.
	www.metaresearch.org /msgboard/topic.asp?whichpage=-1&TOPIC_ID=927&REPLY_ID=15030 (1190 words)

	Questioning Terrestrial Planets :: Astrobiology Magazine :: (Site not responding. Last check: 2007-10-13)
		As far as we know, the maximum size of a terrestrial planet is somewhere between one and ten Earth masses, or between the mass of the Earth and the mass of Neptune.
		Planets further out are also easier to see from an angular separation standpoint.
		If, in observing thousands of stars, Kepler finds that only one out of a hundred stars has a terrestrial planet, then we're going to be in trouble with a TPF core target list of only 35 stars, and we will have to rethink the mission.
	www.astrobio.net /news/modules.php?op=modload&name=News&file=article&sid=1538&mode=thread&order=0&thold=0 (1329 words)

	Universe Today - Large Rocky Planet Discovered
		The new planet whips around the star in a mere two days, and is so close to the star's surface that its temperature probably tops 400 to 750 degrees Fahrenheit (200 to 400 degrees Celsius)—oven-like temperatures far too hot for life as we know it.
		Nevertheless, the ability to detect the tiny wobble that the planet induces in the star gives astronomers confidence that they will be able to detect even smaller rocky planets in orbits more hospitable to life.
		Using dynamical models of how the two Jupiter-size planets interact, they were able to calculate the masses of the two giant planets from the observed shapes and precession rates of their oval orbits.
	www.universetoday.com /am/publish/large_rocky_planet.html (1552 words)

	Terrestrial Planet Finder
		Such planets will be found quite close to their star, where the temperatures are too high for the planet to be mainly made of ice.
		Cool planets will be brighter at the long wavelength end of their spectrum; hot planets will be brighter at the short wavelength end.
		If a terrestrial planet is too close to its star, it loses water from its atmosphere and surface.
	www.terrestrial-planet-finder.com (452 words)

	Terrestrial Planet Finder Lancering 2014 on Flickr - Photo Sharing!
		Het gebruiken van spectroscopische instrumenten op de Terrestrial Planet Finder, wetenschappers zal relatieve hoeveelheden gassen zoals kooldioxide, waterdamp, ozon en methaan meten om te bepalen of een planeet voor het leven geschikt is -- of of er leven reeds daar bestaat.
		Using spectroscopic instruments on Terrestrial Planet Finder, scientists will measure relative amounts of gases like carbon dioxide, water vapor, ozone and methane to determine whether a planet is suitable for life--or whether life already exists there.
		To search for Earth-like planets that might harbor life, the proposed Terrestrial Planet Finder will use multiple telescopes working together to take family portraits of stars and their orbiting planets and determine which planets may have the right chemistry to sustain life.
	www.flickr.com /photos/antoon/310143215 (822 words)

	Earth
		Pictures of the planet taken from space are of considerable importance; for example, they are an enormous help in weather prediction and especially in tracking and predicting hurricanes.
		Unlike the other terrestrial planets, Earth's crust is divided into several separate solid plates which float around independently on top of the hot mantle below.
		Earth is the only planet on which water can exist in liquid form on the surface (though there may be liquid ethane or methane on Titan's surface and liquid water beneath the surface of Europa).
	seds.lpl.arizona.edu /nineplanets/nineplanets/earth.html (1598 words)

	MESSENGER: MErcury Surface, Space ENvironment, GEochemistry, and Ranging
		Understanding this "end member" among the terrestrial planets is crucial to developing a better understanding of how our own Earth formed, how it evolved, and how it interacts with the Sun.
		Each of the terrestrial (class of planets that are like Earth) planets is composed of a dense iron-rich core surrounded by a mantle of magnesium and iron silicates (rock).
		Mercury's uncompressed density (what its density would be without compaction of its interior by the planet's own gravity) is 5.3 grams per cubic centimeter, by far the highest of all the terrestrial planets.
	messenger.jhuapl.edu /why_mercury/index.html (1829 words)

	Terrestrial Planet Atmospheres/Interiors
		If the planet cools quickly, there is little to no tectonic activity and the icy materials are trapped in the mantle (see for example the Galilean moons).
		The latter evolution of this outgassing is driven primarily by the surface temperature and chemistry of the planet.
		Thus, the higher the mass of the planet, the greater the amount of energy deposited on it during formation, the greater the heat and, therefore, the greater the amount of tectonic activity.
	zebu.uoregon.edu /~js/ast121/lectures/TuTh/lec08.html (2978 words)

	Terrestrial Planet Interiors
		The thickness of a planet's crust is directly proportional to the rate at which the planet cooled in the distant past.
		The make-up of planet interiors is dominated by the physics of materials under high temperatures and pressures.
		Due to this, the composition of the crusts is dominated by H2O and CO2 ice.
	abyss.uoregon.edu /~js/ast121/lectures/lec16.html (875 words)

	Introduction to the Geology of the Terrestrial Planets
		The terrestrial planets are rocky planets that have properties similar to that of the Earth.
		But the separation of the planets into Terrestrial and Jovian is not based on their masses or physical sizes, it is based on their densities (the last column in the table).
		Mercury is the planet closest to the Sun, so it is the terrestrial planet that gets hit by comets, asteroids and meteroids more often than the other planets because the Sun's gravity tends to collect small bodies like comets and asteroids.
	ganymede.nmsu.edu /astro/a110labs/labmanual/node4.html (3656 words)

	The Terrestrial Planet Finder and SETI - Article - Red Colony (Site not responding. Last check: 2007-10-13)
		Some time ago, NASA released plans for The Terrestrial Planet Finder, an orbital telescope platform that is still under design that will be launched in about 10 years.
		Possessing the ability to locate and analyze alien planets of almost any size for quite a distance from Earth, The TPF could be used to identify worlds that are inhabited by, or at least have had work done on them by aliens.
		The presence of an intelligent race on a vaguely Earth-like planet may have effects on its atmosphere and surface at some point in time, some worlds may have even been totally changed by one (such as us terraforming Mars or Ganymede).
	www.redcolony.com /art.php?id=0409050 (901 words)

	Terrestrial Planet Imager
		A possible future NASA mission, part of the Origins Program, which would follow on from the Terrestrial Planet Finder (TPF) and produce images of Earth-like planets.
		To obtain a 25 x 25 pixel image of an extrasolar planet would call for an array of 5 TPF-class optical interferometers flying in formation.
		Each interferometer would consist of four 8-m telescopes to collect light and null it (see nulling interferometry) before passing it to a single 8-m telescope which would relay the light to a combining spacecraft.
	www.daviddarling.info /encyclopedia/P/PlanetImager.html (185 words)

	A MEETING WITH THE UNIVERSE (Site not responding. Last check: 2007-10-13)
		Only 40 percent larger in diameter than the Moon, Mercury is the closest planet to the Sun, and its sunlit surface is hot enough to melt lead.
		The planet is so small and so far away from Earth that it was only a dull white blur in telescopes before the Space Age.
		Mercury is a scorched, primordial world which must retain traces of how planets were formed in a part of the solar system remote from the Earth and Moon.
	www.hq.nasa.gov /office/pao/History/EP-177/ch2-2-2.html (474 words)

	Properties of Planets (Lab 2) The Planets
		Because each of the planets has different properties, we will also look at how our weight would change if we were standing on them.
		The first four planets are the terrestrial planets.
		A terrestrial planet has a metallic core (usually iron) and a rocky surface.
	www.unm.edu /~astro1/101lab/lab2/lab2_B.html (161 words)

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