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Topic: Great Dark Spot

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	The Planet Neptune
		The dark spot may be a zone of clear gas that is a window to a cloud deck lower in the atmosphere.
		Small trails of clouds trending east to west and large-scale structure east of the Great Dark Spot all suggest that waves are present in the atmosphere and play a large role in the type of clouds that are visible.
		Great Dark Spot Feathery white clouds fill the boundary between the dark and light blue regions on the Great Dark Spot.
	members.tripod.com /Zellman1.0/neptune.html (1151 words)

	Welcome to the Neptune
		The Great Dark Spot with its bright white companion is slightly to the left of center.
		Feathery white clouds fill the boundary between the dark and light blue regions on the Great Dark Spot.
		Dark streaks across the south polar cap may be the result of recent geyser-like eruptions of gas, dust, and ice venting from beneath the cap into the satellite's near-vacuum atmosphere.
	www.csulb.edu /web/courses/geo/planets/nep.html (1122 words)

	Neptune - Printer-friendly - MSN Encarta
		The largest storm, known as the Great Dark Spot, appeared in the planet’s southern hemisphere and was photographed extensively in 1989 by the Voyager 2 spacecraft.
		Scientists estimated that the Great Dark Spot was as large in diameter as Earth is. By 1994 images transmitted to Earth by the Hubble Space Telescope showed that the Great Dark Spot had disappeared.
		The chemical makeup of the cloud particles that form Neptune's Great Dark Spots is not known.
	encarta.msn.com /text_761577112___4/Neptune.html (819 words)

	Exploring The Planets - Neptune - Atmosphere (Site not responding. Last check: 2007-11-03)
		The "Great Dark Spot" discovered by Voyager 2 is a storm system that resembles Jupiter's Red Spot, and is surrounded by white cirrus clouds of frozen methane.
		These images of the Great Dark Spot were taken by Voyager 2 over a 4 1/2 day period at intervals of 18 hours.
		The Great Dark Spot may have an overall counterclockwise rotation as suggested by the lighter toned clouds surrounding the main spot.
	www.nasm.si.edu /ceps/etp/neptune/nept_atmos.html (127 words)

	SPACE.com -- Dark Spot on Jupiter Bigger than Famed Great Red Spot
		West believes the Dark Spot is a curious side-effect of auroras on Jupiter.
		Indeed, the Great Dark Spot is invisible to the human eye.
		West explains: "This dark spot is trapped by a polar vortex--a jet stream that encircles Jupiter's north pole." Fast-moving winds in the vortex act like an atmospheric wall, keeping the Dark Spot corralled at high latitudes.
	www.space.com /scienceastronomy/dark_spot_030313.html (912 words)

	Voyager - Science - Planetary Voyage - Neptune
		Neptune's Great Dark Spot is comparable in size, relative to the planet, and at the same latitude (the Great Dark Spot is at 22 degrees south latitude) as Jupiter's Great Red Spot.
		Bright, wispy "cirrus-type" clouds overlaying the Great Dark Spot at its southern and northeastern boundaries may be analogous to lenticular clouds that form over mountains on Earth.
		Another spot, designated "D2" by Voyager's scientists, is located far to the south of the Great Dark Spot, at 55 degrees south.
	voyager.jpl.nasa.gov /science/neptune_neptune.html (763 words)

	Neptune
		The Great Dark Spot imaged by Voyager at a distance of 2.8 million km (1.7 million miles).
		This hurricane-like "Great Dark Spot" was big enough to contain the entire Earth, spun counterclockwise, and moved westward at almost 1,200 km/h (750 mph).
		A comparable spot appeared in 1994 in Neptune's northern hemisphere but had disappeared by 1997.) Voyager 2 also photographed clouds casting shadows on a lower cloud deck, enabling scientists to visually measure the altitude differences between the upper and lower cloud decks.
	www.daviddarling.info /encyclopedia/N/Neptune.html (814 words)

	Neptune's Great Dark Spot of 1989
		Unlike Jupiter's Great Red Spot, the Great Dark Spot of Neptune is thought to be a hole, similar to the hole in the ozone layer on Earth, in the methane cloud deck of Neptune.
		The Great Red Spot of Jupiter is thought to be a hurricane which has been raging on Jupiter for at least 400 years.
		The Great Dark Spot, seen here by Voyager in 1989, disappeared (either dissipating or being masked) in 1994, and was replaced very soon by a similar "Spot" in a similar place, but in the north instead of in the south.
	www.windows.ucar.edu /tour/link=/neptune/atmosphere/N_clouds_GDS.html (189 words)

	Space Today Online - Solar System - Exploring Neptune - The Planet Neptune
		The Great Dark Spot at the center is about 8,000 miles by 4,000 miles in size.
		Bright, wispy, cirrus-type clouds hovering near the Great Dark Spot are higher in altitude than the dark material, which defines its boundaries.
		Bright streaks of cloud at the latitude of the Great Dark Spot, the small clouds overlying it, and a dimly visible dark protrusion at its western end are examples ofdynamic weather patterns on Neptune, which can change significantly during one rotation of the planet — about l8 hours.
	www.spacetoday.org /SolSys/Neptune/NeptunePlanet.html (1267 words)

	Neptune - Crystalinks
		It is currently not known why the Great Dark Spot appeared in the first place; whether it is a common occurrence on Neptune or a bizarre phenomenon remains to be seen.
		The Great Dark Spot, a cyclonic storm system the size of Eurasia, was captured by Voyager 2 in the 1989 flyby.
		The Wizard's Eye (Great Dark Spot 2) is a southern hurricane, the second intensive hurricane on the planet.
	www.crystalinks.com /neptune.html (3201 words)

	Pictures of the Planet Neptunes Great Dark Spot
		Dark Spot 2 is near the bottom of this picture - with the bright center.
		The Great Dark Spot is about the same size as the Earth and is composed of frozen methane.
		The direction that the V-shaped structure near the right-hand edge of the bright spot area points to, might indicate that Neptune's small dark spot rotates clockwise.
	www.the-solar-system.net /planet-neptune/great-dark-spot-pictures.html (291 words)

	Great Red Spot - Wikipedia, the free encyclopedia
		The Great Red Spot is a persistent anticyclonic storm on the planet Jupiter, 22° south of the equator, which has lasted at least 340 years.
		This dramatic view of Jupiter's Great Red Spot and its surroundings was obtained by Voyager 1 on February 25, 1979, when the spacecraft was 9.2 million km (5.7 million miles) from Jupiter.
		The colorful, wavy cloud pattern to the left of the Red Spot is a region of extraordinarily complex and variable wave motion.
	en.wikipedia.org /wiki/Great_Red_Spot (453 words)

	Neptune's Great Dark Spot (Site not responding. Last check: 2007-11-03)
		This close up view of the Great Dark Spot was actually taken at from a distance of 590,000 km by Voyager 2’s wide-angle camera.
		It shows the clouds’ structure in the dark regions near the pole and the bright clouds east of the Great Dark Spot.
		Small trails of similar clouds trending east to west and large scale structure east of the Great Dark Spot all suggest that waves are present in the atmosphere and play a large role in the type of clouds that are visible.
	www.solarsystem.org.uk /neptune/cap3.html (87 words)

	Neptune - A distant world
		The size of the Earth, this marking is thought to be a region of high pressure that lacks the typical atmospheric methane.
		Although similar in many ways, the Great Dark Spot seems to have been formed much deeper in the atmosphere than Jupiter’s blemish.
		The Dark Spot was thought to be a long-term feature, but observations by Voyager 2 and the Hubble space telescope showed the marking disappear rapidly and then reappear elsewhere.
	www.solarsystem.org.uk /neptune (392 words)

	The Spots of Neptune (Site not responding. Last check: 2007-11-03)
		In contrast to the Great Red Spot on Jupiter, the GDS is very dark and about a third the size (it can fit about one Earth inside).
		The dark area seen could be a swirling region of transparent gas that acts as a window to a lower area in Neptune.
		It was south of the Great Dark Spot and is probably a storm in the atmosphere.
	library.thinkquest.org /28327/html/universe/solar_system/planets/neptune/surface/landmarks/spots.html (434 words)

	HubbleSite - NewsCenter - Hubble Space Telescope Observations of Neptune (06/14/1995) - Release Images
		These bright clouds and dark spots were tracked as they moved across the planet's disk, revealing wind speeds as large as 325 meters per second (730 miles per hour).
		The largest of the giant, dark storm systems, called the "Great Dark Spot", received special attention because it resembled Jupiter's Great Red Spot, a storm that has persisted for more than three centuries.
		The lifetime of Neptune's Great Dark Spot could not be determined from the Voyager data alone, however, because the encounter was too brief.
	hubblesite.org /newscenter/archive/releases/1995/09/image/a (1268 words)

	Dark Spot (Site not responding. Last check: 2007-11-03)
		Neptune has a Great Dark Spot similar to the Great Red Spot on Jupiter.
		The Dark Spot is half the size of the Red Spot.
		There is another, smaller, Dark Spot in the Southern Hemisphere (southern half) of Neptune.
	library.thinkquest.org /J002232F/neptune/greatdarkspot.htm (56 words)

	NASA's Cosmos
		The faint sunlight at Neptune’s great distance cannot provide the energy of such winds; they are probably energized by heat from the interior of the planet.
		The Great Dark Spot of Neptune, rotating in the anti-cyclonic, counterclockwise direction, is as large as the Earth, and about half as large as the Great Red Spot of Jupiter.
		The spot may be rotating in the cyclonic clockwise direction, opposite to that of the Great Dark Spot on Neptune and the Great Red Spot on Jupiter.
	ase.tufts.edu /cosmos/print_images.asp?id=11 (1767 words)

	New York City Research Initiative
		Study of the Great Dark Vortex on Jupiter is meant to discover how and why the vortex forms and what factors contribute to its formation.
		The Great Dark Vortex, also known as the Great Dark Spot is currently under investigation for its peculiar formation and deterioration.
		The three dates studied are on September 1997 with the dark spot clearly visible, November 1997 with signs of the deterioration of the Great Dark Spot and its trail, and on August 1999 with no sign of the Great Dark Spot.
	education.gsfc.nasa.gov /nycri/research/LGCC.html (405 words)

	Space, pluto, uranus, neptune (Site not responding. Last check: 2007-11-03)
		The Great Dark Spot (GDS) seen at the center is about l3,000 km by 6,600 km in size -- as large along its longer dimension as the Earth.
		The bright, wispy "cirrus-type" clouds seen hovering in the vicinity of the GDS are higher in altitude than the dark material of unknown origin which defines its boundaries.
		The picture shows the Great Dark Spot and its companion bright smudge; on the west limb the fast moving bright feature called Scooter and the little dark spot are visible.
	www.buddycom.com /space/uranepplu (1054 words)

	HubbleSite - NewsCenter - Hubble Discovers New Dark Spot on Neptune (04/19/1995) - Introduction
		The new dark spot is a near mirror image of the one found in the Southern Hemisphere.
		Bright, high-altitude clouds accompany the new northern dark spot.
		The new spot might be a hole in Neptune's methane cloud tops, giving astronomers a peek at lower levels of the atmosphere.
	hubblesite.org /newscenter/archive/releases/1995/21 (145 words)

	APOD: 2003 March 19 - Jupiter's Great Dark Spot (Site not responding. Last check: 2007-11-03)
		Red Spot, the Great Dark Spot lies near Jupiter's north pole and seems to appear and disappear over periods of months rather than persisting for hundreds of years.
		Seen at ultraviolet wavelengths, the dark feature resides in the Jovian stratosphere confined by pole-encircling winds, analogous to planet Earth's antarctic ozone hole.
		The white circle marks 60 degrees latitude and the blue contour outlines a persistent Jovian auroral zone which may be related to the formation of the Great Dark Spot.
	antwrp.gsfc.nasa.gov /apod/ap030319.html (206 words)

	Neptune's Blue Spots (Site not responding. Last check: 2007-11-03)
		These are shown in the atmosphere by dark spots.
		The biggest dark spot, known as the Great Dark Spot, was first observed in 1989 by
		The storms in the spots also force icy methane crystals high up into the atmosphere of Neptune, forming white clouds.
	members.aol.com /bobalien99/neptspot.htm (133 words)

	Neptune, gas giant with great dark spot
		There are several cloud features, the most prominent being the great dark spot, a huge storm system which is as big as the Earth.
		The great dark spot and the small dark spot are oval-shaped anticyclones in Neptune's atmosphere that are thought to be caused by the difference in temperature between the heat-producing core and the frigid cloud tops.
		A small cirrus cloud called the scooter lies at a different altitude to the spots, where it is less windy; this cloud remains in the same position relative to Neptune's core and is carried by the planet's rotation in the opposite direction to the spots.
	www.astronomytoday.com /astronomy/neptune.html (633 words)

	UCR Space Physics
		Similar to Jupiter's Great Red Spot, Neptune has a storm system, dubbed the Great Dark Spot, as large as Earth that rotates counterclockwise in 16 days.
		In addition to the Great Dark Spot, Neptune has a Dark Spot 2, an almond-shaped storm system, with a shiny core, that takes 16 hours to revolve eastward around the planet.
		The darker, redder coloring north of the south polar cap may be the result of ultraviolet light and magnetospheric radiation reacting with the methane on the surface and in the atmosphere.
	spacephysics.ucr.edu /index.php?content=v25/v7.html (1027 words)

	:: NASA Quest > Archives :: (Site not responding. Last check: 2007-11-03)
		We know it's new because it is in the Northern hemisphere of the planet, but the Voyager Great Dark Spot was in the Southern hemisphere.
		In addition to the Dark Spots, which are tricky to find, Neptune has LOTS of bright spots which are easy to see.
		I may or may not be able to find a Great Dark Spot with this data.
	quest.arc.nasa.gov /hst/new-neptune.html (710 words)

	NASA's Solar System Exploration: Education: Themes
		One of the most famous landmarks of Jupiter is the Great Red Spot, a huge hurricane at least 340 years old.
		In 1989, the Great Dark Spot, a cyclonic storm system, was discovered by NASA's Voyager 2 spacecraft.
		While the storm did resemble the Great Red Spot of Jupiter, on November 2, 1994 the Hubble Space Telescope was no longer able to locate the Great Dark Spot on the planet.
	solarsystem.nasa.gov /educ/themes/display.cfm?Item=hurricane (524 words)

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