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Topic: Hellas Planitia

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	Hellas Planitia - Wikipedia, the free encyclopedia
		Hellas Planitia, also known as the Hellas Impact Basin, is a roughly circular impact crater located in the southern hemisphere of the planet Mars.
		Due to its size and contrasting light colour, Hellas Planitia was one of the first Martian features discovered from Earth by telescope.
		The floor of Hellas shows diverse landforms, some of which appear volcanic in origin (this assumes the basin filled with melt soon after the impact event).
	en.wikipedia.org /wiki/Hellas_Planitia (304 words)

	Mars' Basins
		From a distance, the Hellas Planitia basin is one of the most spectacular features on Mars—a circular crater, 1,300 miles across, with a brightly reflective floor and raised terrain all around it.
		Planitia is a Latin term often applied to Martian basins: It simply means "low plain/' The bottom of the Hellas basin is no exception, lying an average nine miles below the surrounding highlands.
		Hellas has been known to astronomers for over a century—it is easily spotted as a bright circular feature through a small telescope.
	www.ozgate.com /infobytes/mars_basins.htm (578 words)

	SCARS OF MARS
		The Hellas impact asteroid, the core of Astra, may have been between 850 and 900 miles in diameter, and it probably struck Mars at a speed of 6000 miles per hour, which is 100 miles per minute.
		The angle formed between Hellas Planitia, the smooth, magma-covered region engulfing the Hellas Crater, and the Tharsis Bulge suggests the trajectory of Hellas as it approached Mars.
		Astra and the fragment Hellas careened toward Mars slightly from the south of the ecliptic (orbital) plane of Mars.
	www.thule.org /mars/mars2.html (4441 words)

	Altitude of the Lowest Point on Mars
		"Hellas Planitia is a giant impact basin in the southern hemisphere.
		"Hellas is thought to have been formed by the impact of a mountain-sized body on Mars in the early days of the solar system.
		Hellas is by far the largest and deepest impact basin on Mars.
	hypertextbook.com /facts/2003/AllisonChin.shtml (475 words)

	Planitia
		Hellas Planitia Hellas Planitia, also known as the Hellas Impact Basin, is a roughly circular impact billion years ago...
		Utopia Planitia Utopia Planitia is the location where the Viking 2 Mars lander landed and first explored on September 3,...
		Utopia Planitia Fleet Yards In the USS Voyager (NCC-74656).
	www.brainyencyclopedia.com /topics/planitia.html (88 words)

	MarsLink: Activity 3 (Site not responding. Last check: 2007-10-05)
		Hellas Planitia is the deepest basin on Mars.
		Indeed, humans might consider landing in Hellas because the atmospheric pressure is highest at low elevations, and thus there is more atmosphere to slow the descent of a landing spacecraft.
		The rim of the immense, weathered Hellas impact basin is pitted by ancient craters.
	cmex-www.arc.nasa.gov /CMEXCD/NSTA95/TeachCen/TOPO/Act3/Act3.htm (1271 words)

	Adler Planetarium / Learning Astronomy / Planets / Mars / Hellas Planitia (Site not responding. Last check: 2007-10-05)
		Hellas Planitia is the largest impact basin in the southern highlands.
		The Hellas basin is roughly 1430 miles (2300 kilometers) across.
		The Hellas crater is the circular feature that dominates the image to the left.
	www.adlerplanetarium.org /learn/planets/mars/hellasplanitia.ssi (139 words)

	Catalog Page for PIA06944
		The best time of year to obtain images of the floor of the vast Hellas Planitia impact basin occurs in mid to late southern autumn.
		Hellas was in this ideal period during July-September 2004.
		Hellas has some of the lowest elevations on the planet.
	photojournal.jpl.nasa.gov /catalog/PIA06944 (132 words)

	Re: Tharsis Planum Mars caused by Hellas Planitia impact ?
		Hellas is much, much older than this, at around 3.9 billion years old.
		So if Hellas caused Tharsis, the effect would have had to continue to cause Tharsis to erupt over billions of years.
		Even an impact as big as Hellas wouldn't be enough to pop Tharsis out of the other side of the planet.
	www.madsci.org /posts/archives/2004-03/1079317263.Ph.r.html (530 words)

	The Starfleet Museum - Pyotr Velikiy and Constitution Classes
		Representatives from Hellas Planitia, Mars, the site of Starfleet's main M/AM laboratory, reported results of preliminary computer studies for a new reactor, the SSWR-XV, which was to exploit recently developed theories for increasing the efficiency of matter/antimatter (M/AM) interaction.
		Despite the assurances of Hellas Planitia engineers, their developmental forecasts had often proved unrealistically optimistic and minimized the difficulty of overcoming obstacles, which were often not initially apparent.
		In April 2239, the main SSWR-XIIIB M/AM reactor arrived from Hellas Planitia and was installed in the secondary hull of PYOTR VELIKIY.
	www.starfleet-museum.org /pyotr-velikiy.htm (4493 words)

	Hellas To Utopia (Site not responding. Last check: 2007-10-05)
		The Martian eastern hemisphere from Hellas Planitia in the south to Utopia Planitia, the site of the Viking 2 lander, in the north, and further northwards to the Martian pole, is introduced for the general scientific reader.
		Hellas Planitia and its surroundings are the remnants of a gigantic impact event early in the history of the red planet.
		For example, in the case of Isidis Planitia, the periphery of its great impact basin is traversed by damaged volcanic craters, exhumed dykes and spatter ridges.
	www.wheelers-warehouse.co.uk /science_pages/Hellas.html (4952 words)

	Mars by Viking, 1975 through 1987.
		The central part, which is dominated by light-colored, relatively smooth to hummocky plains of Amazonis Planitia, is partly bounded to the east by the western flank of the largest known volcano in the solar system, Olympus Mons, and its associated aureole deposits.
		The southern one-third is characterized by mountainous and knobby terrain of the northern rim of the enormous Hellas impact basin.
		The highlands are separated from the northern plains of Elysium Planitia by a highly dissected, discontinuous northwest trending scarp.
	xpda.com /mars/viking (8011 words)

	[No title]
		Hellas assemblage Consists of units in and near Hellas Planitia.
		The term ÒassemblageÓ (Scott and Tanaka, 1986) is employed for sets of units that share common attributes; for example, the Hellas assemblage encompasses those units associated with the formation and modification of the Hellas basin.
		Partial filling, mantling, and modification of the Hellas basin continued through the middle of the Amazonian Period to produce the younger units of the Hellas assemblage.
	astrogeology.usgs.gov /Projects/PlanetaryMapping/DIGGEOL/mars/marseast/metxt.asc (7798 words)

	Mars Exploration: Multimedia
		Taken on April 8, 2001 (mid-southern winter), this is a mosaic of six MOC daily global images centered around Hellas Planitia in the martian southern hemisphere.
		Hellas Planitia is the dominant elliptical feature just below the center of the picture.
		The bright, nearly white surfaces along the lower (southern) edge of the picture are covered by wintertime frost.
	mars.jpl.nasa.gov /gallery/duststorms/E3_795-796_803-804_816-817.html (264 words)

	Catalog Page for PIA00416
		A color image of the Hellas Planitia region of Mars; north toward top.
		The scene shows the Hellas plain within the 1,800- km-diameter Hellas basin, an ancient impact basin (and the largest basin on Mars) formed when a large projectile (asteroid, comet, meteor) hit the surface.
		The plains of Hellas are very complex; fluvial channels drain into the basin and the plains have been described as being a mixture of fluvial, lacustrine, glacial, eolian, and volcanic deposits.
	photojournal.jpl.nasa.gov /catalog/PIA00416 (224 words)

	Site 080 (Site not responding. Last check: 2007-10-05)
		Hadriaca is a Mid-Hesperian central vent volcano northeast of Hellas Planitia, with radial ridges, a low profile and a smooth floored caldera at its center.
		Dao Vallis, an apparent outflow channel, drops 5 km in elevation as it descends across the southwestern flank of Hadriaca to its terminus in Hellas Planitia.
		If possible, departures from this general flight plan should be made for a closer (and possibly even a surface landing) investigation of interesting features as they are spotted on the images produced by this proposed balloon survey and traverse.
	cmex-www.arc.nasa.gov /MarsTools/Mars_Cat/Part_3/Sites/site080.html (736 words)

	HubbleSite - Mars Opposition - Image - 3/18/1991
		Arabia Planitia, the bright region to the west of Syrtis is thought to be bright because of a thin layer of dust (perhaps amounting to a few meters in thickness) deposited on its surface.
		The bright region to the east, Isidis Planitia, is a 1000 kilometer wide (620 miles) impact basin formed as a result of a large meteoroid collision more than two billion years ago.
		To the south of Syrtis Major is the bright Hellas Planitia basin.
	www.hubblesite.org /newscenter/newsdesk/archive/releases/1991/05/image/a (711 words)

	Winds of Mars: Aeolian Activity and Landforms Glossary
		Argyre Planitia is an 800-km-diameter impact basin located at -50°, 45°.
		Hellas Planitia is a 2000-km-diameter impact basin located at -40°, 290°.
		Hellas is an ancient name for Greece and is also a district in ancient Greece.
	www.lpi.usra.edu /publications/slidesets/winds/glossary.shtml (989 words)

	Adler Planetarium / Learning Astronomy / Planets / Mars / Argyre Planitia (Site not responding. Last check: 2007-10-05)
		Argyre Planitia is located in the southern highlands.
		It is the second largest impact basin on Mars after Hellas Planitia.
		This means the impact that created Argyre Planitia is thought to have occured 3.9 billion years ago.
	www.adlerplanetarium.org /learn/planets/mars/argyreplanitia.ssi (87 words)

	summary english (Site not responding. Last check: 2007-10-05)
		These represent the 'highlands' (Ascraeus Mons), the 'lowlands' (Hellas Planitia), and at the mouth of the large canyon structure Valles Marineris (Chryse Planitia).
		In the Chryse Planitia region this water content was found somewhat closer to the surface (200 meters) while in the Hellas Planitia region, no significant water was found to the depth of 300 meters.
		Both the Ascraeus Mons and the Hellas Planitia regions have indications of radioactivity consistent with uranium deposits.
	marsville.enoreo.on.ca /secondary/mission/summary.htm (812 words)

	ESA - Science - Home - Promethei Terra, southern highlands of Mars
		It shows a close-up view of a crater in the Promethei Terra region, east of the Hellas Planitia impact basin.
		It shows a large impact crater in the Promethei Terra region, east of the Hellas Planitia impact basin.
		It shows an area in the Promethei Terra region, east of the Hellas Planitia impact basin.
	www.esa.int /esaSC/SEM95XMKPZD_index_3.html (683 words)

	Weather on Mars: The Hellas Plantia Region (Site not responding. Last check: 2007-10-05)
		The Hellas Basin area was selected for this data analysis because its relatively unusual character.
		The three plots suggest that a cold air mass moved across the Hellas region around day 20, a less intense one between days 30 and 40, and a moderate drop in temperature in the vicinity of day 44.
		Some of the variations in the low points in the curves may stem from the very wide area (4800 km east to west and 1600 km north to south) over which the measurements were taken.
	www.nfinity.com /~exile/marsweather.htm (3155 words)

	New Mars Close-Ups Show Diverse Terrain :: Astrobiology Magazine :: Search for Life in the Universe
		The camera aboard the Mars Global Surveyor spacecraft captured this image of the strange "taffy-pull" terrain of northwestern Hellas Planitia on the surface of Mars.
		The origin of the pattern is unknown, but may be related to the erosion of different layers of bedrock and mass movement of debris.
		It includes many views of north polar terrain, extremely clear-atmosphere views of a deep southern basin named Hellas Planitia, and a variety of Martian landforms between the north pole and the southern middle latitudes.
	www.astrobio.net /news/article616.html (1305 words)

	Terragen renderings of Mars
		Flyover from the submerged northeast Hellas Planitia to the Hesperia Planum
		Flyover from the submerged Isidis Planitia to the Hesperia Planum.
		View from the Amazonis Planitia (The Nicholson Crater) to the Medusae Fossae (left).
	home.tiscali.nl /~veenen/terragen/mars/mars_frame.html (406 words)

	Terragen renderings of Mars (Site not responding. Last check: 2007-10-05)
		Hellas Planitia with Dao- Niger and Harmakhis Vallis
		An ancient but also todays icy overhead view of the north eastern part of the Hellas Planitia, the largest crater on Mars.
		In the north the eroded volcano Hadriaca Patera lays on the rim of the bassin, and from north to south the large valleys Dao, Niger and Harmakhis Vallis were once shaped by water coming from the Hesperia Planum..
	www.space4case.com /mars/mars7/mars161.html (89 words)

	Geologic Map of the Hellas Region of Mars (Site not responding. Last check: 2007-10-05)
		This geologic map of the Hellas region focuses on the stratigraphic, structural, and erosional histories associated with the largest well-preserved impact basin on Mars.
		Along with the uplifted rim and huge, partly infilled inner basin (Hellas Planitia) of the Hellas basin impact structure, the map region includes areas of ancient highland terrain, broad volcanic edifices and deposits, and extensive channels.
		The Hellas region, whose name refers to the clas-sical term for Greece, has been known from telescopic observations as a prominent bright feature on the sur-face of Mars for more than a century (see Blunck, 1982).
	geopubs.wr.usgs.gov /i-map/i2694 (230 words)

	Mars surface
		Also white water clouds can be observed near the giant Tharsis volcanoes and Hellas planitia, as well as a general cloud haze around the equator.
		The giant size of the tectonic rip in the crust is also seen in the width, extending usually about 100 km but at times 400-600 km wide, and in the depth, which can be as much as 6-7 km.
		North-east of Hellas a second series of large volcanoes sticking out of the low lava plains at Elysium can be found, almost as high as the Tharsis volcanoes.
	www.student.oulu.fi /~jkorteni/space/mars/surface (1146 words)

	The Relief Globe Company (Site not responding. Last check: 2007-10-05)
		Hellas Planitia appears as the flat side of Mars, opposite Olympus Mons.
		A yellow line was drawn to be perpendicular to Hellas Planitia.
		One may speculate that a large asteroid hit Hellas Planitia while traveling in the direction of the yellow line.
	www.reliefglobe.com /mars_price7.html (344 words)

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