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Topic: Orbiters

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	Space Shuttle - Wikipedia, the free encyclopedia
		The four elevons, mounted at the trailing edge of the wings, and the rudder/speed brake, attached at the trailing edge of the stabilizer, with the body flap, control the Orbiter during descent and landing.
		The orbiter structure is made primarily from aluminium alloy, although the engine thrust structure is made from titanium (alloy).
		The Orbiter's speed is reduced from 424 mph (682 km/h) to approximately 215 mph (346 km/h), (compared to 160 mph for a jet airliner), at touch-down.
	en.wikipedia.org /wiki/Space_shuttle (3623 words)

	Mars - Facts, Information, and Encyclopedia Reference article
		In 2003, methane was apparently discovered in the atmosphere by Earth-based telescopes and possibly confirmed in March 2004 by the Mars Express Orbiter; present measurements state an average methane concentration of about 11±4 ppb by volume (see reference).
		Dozens of spacecraft, including orbiters, landers, and rovers, have been sent to Mars by the Soviet Union, the United States, Europe, and Japan to study the planet's surface, climate, and geography.
		Mars Express Orbiter confirmed the presence of water ice and carbon dioxide ice at the planet's south pole.
	www.startsurfing.com /encyclopedia/m/a/r/Mars_(planet).html (3890 words)

	Lunar Orbiters
		Manned lunar orbiters and orbiting stations were rarely designed for this purpose alone, but usually used in a lunar-orbit rendezvous lunar landing scenario together with a separate lunar lander.
		For lunar base support, lunar orbiters made little sense unless the activities on the moon's surface were located either along the equator or near the poles (since otherwise the moon's slow rotation meant that the orbit would pass over the sites only twice a month).
		Lunar orbiter proposed by Korolev in January 1960.
	www.astronautix.com /craftfam/luniters.htm (971 words)

	Mars (Site not responding. Last check: 2007-10-31)
		In 2004 the Mars Expedition Rovers "Spirit" and "Opportunity" landed on Mars sending back geologic data and many pictures; they are still operating after more than a year on Mars.
		Three Mars orbiters (Mars Global Surveyor, Mars Odyssey, and Mars Express) are also currently in operation.
		Three orbiters and two landers are now in operation at Mars.
	www.seds.org /nineplanets/nineplanets/mars.html (2231 words)

	Space Exploration Portal @ LaunchBase.org (Launch Base) (Site not responding. Last check: 2007-10-31)
		The first partially reusable orbital spacecraft, the Space Shuttle, was launched by the USA on the 20th anniversary of Yuri Gagarin's flight, on April 12, 1981.
		During the Shuttle era, six orbiters were built, all of which have flown in the atmosphere and five of which have flown in space.
		The Enterprise was used only for approach and landing tests, launching from the back of a Boeing 747 and gliding to deadstick landings at Edwards AFB, California.
	www.launchbase.org (2305 words)

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