| Piú votate - A Tribute To Mars Global Surveyor |
Chaotic_Terrain-Eos_Chaos-00.jpgFeatures of Eos Chaos: Circular Butte (Original NASA/MGS/MSSS b/w Frame - 1)53 visiteOriginal caption:"This MGS-MOC image shows light-toned, Layered Rock Outcrops in Eos Chaos, located near the East end of the Valles Marineris Trough System. The Outcrops occur in the form of a distinct, circular Butte (image 1) and a high Slope (image 2). The rocks might be sedimentary rocks, similar to those found elsewhere exposed in the Valles Marineris System and the Chaotic Terrain to the East of the Region".
Location near: 12,9° South Lat. and 49,5° West Long.
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Southern Summer
(5 voti)
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Craters-Airy_Crater-The_Prime_Meridian-0.JPGMars' Prime Meridian, such as: Longitude "0" (1 - Original NASA/MGS/MSSS CTX b/w Frame)61 visiteOn Earth, the Longitude of the Royal Observatory in Greenwich, England is defined as the "Prime Meridian" or the 0 point of Longitude. Locations on Earth are measured in degrees East or West from this position.
The Prime Meridian was defined by an International Agreement in 1884 as the position of the Transit Circle: a large telescope located in the Observatory's Meridian Building. The Transit Circle was built by Sir George Biddell Airy, the 7th Astronomer Royal, in 1850. While visual observations with Transit were the basis of navigation until the space age, it is interesting to note that the current definition of the Prime Meridian is in reference to orbiting satellites and Very Long Baseline Interferometry (VLBI) measurements of distant radio sources such as quasars.
However, said "International Reference Meridian" is now about 100 mt East of the Transit Circle at Greenwich.
For Mars, the Prime Meridian was first defined by German astronomers W. Beer and J. H. Mädler in 1830-32.
(5 voti)
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Craters-Eberswalde_Crater-1-PIA04293_modest.jpgEberswalde Crater and Delta in HR55 visiteOriginal caption:"Scientifically, perhaps the most important result from use of the MOC on NASA's MGS during that spacecraft's extended mission has been the discovery and documentation of a 'fossil delta'. The feature is located in a crater northeast of Holden Crater, near 24,0° South Latitude and 33,7° West Longitude. Since the announcement of the discovery of the delta in November 2003, the International Astronomical Union has provided a provisional name (pending final approval) for the crater in which the landforms occur.
The crater has been named Eberswalde (a German town).
This image offers a HR view of a portion of the fossil delta than any seen earlier. North is up. At the bottom of the frame, the image includes the north end of a looping, inverted, meandering channel. The image covers an area of about 3 by 3 Km (about 1,9x1,9 miles). It was produced using a technique called "compensated pitch and roll targeted observation," in which the rotation rate of the spacecraft is adjusted to match the ground speed under the camera. At full resolution, this map-projected image is at 50 centimeters (20 inches) per pixel".
(5 voti)
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Craters-Unnamed_South_Polaer_Buried_Crater-PIA04147.jpgFilled and Buried Unnamed Crater in the South Polar Region (Original NASA/MGS/MSSS b/ Frame)53 visiteOriginal caption:"This MGS-MOC image shows a Circular Depression and a suite of eroding Mesas of CO2 - features occuring in the South Polar Residual Cap of Mars. The eroding CO2 creates landforms reminiscent of 'Swiss Cheese'. The Circular Feature might indicate the location of a filled, Buried Impact Crater".
Location near: 86,8° South Lat. and 111,0° West Long.
Image width: width: ~3 Km (~1,9 mi)
Illumination from: upper left
Season: Southern Spring
(5 voti)
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Volcanic_Features-Fissure-Tharsis_Region-M0806311Det.jpgMartian "Freeway" in Tharsis Region (Original NASA/MGS/MSSS b/w Frame)53 visiteUn'autostrada Marziana (come ci piacerebbe pensare...) o un gigantesco e lunghissimo crack che attraversa la suggestiva regione dove sorgono i vulcani Ascraeus e Pavonis Montes?
Uno splendido fotogramma MGS-MOC che ci mostra l'antico letto di un fiume Marziano o, più probabilmente, il risultato di un grande evento sismico occorso in ere remote. Non possediamo informazioni al riguardo ma potrebbe anche darsi che questo grande canale sia stato disegnato, in prima battuta, da un sisma e poi sia stato "perfezionato", nella sua struttura di dettaglio, da qualche altro evento vulcanico (la Regione è quella giusta...). Le solite dune che appaiono in qualche sua sezione ci fanno anche considerare l'ipotesi che questa gola, un tempo e solo in qualche suo punto preciso, sia anche stata invasa dalle acque.
(5 voti)
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Aeolian_Features-Windstreaks-Becquerel_Crater-M0702802-00.jpgWindstreaks inside Becquerel Crater (Original NASA/MGS/MSSS b/w Frame)55 visitenessun commento
(5 voti)
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Craters-Unnamed_Concentric_Craters-M2100005.jpgConcentric Craters (Original NASA/MGS/MSSS b/w Frame)62 visiteCrateri all'interno di crateri o 'crateri concentrici': si tratta di un fenomeno decisamente raro ed inusuale, ma non (ovviamente) impossibile. Questa Stranezza Marziana non la annoveriamo fra le Anomalie in senso stretto, bensì fra le - semplici - "rarità" che la Natura è capace di creare.
(5 voti)
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Volcanoes-Small_Volcano_in_Jovis_Fpssae-1-2005_07.jpgLost in the Dust: a small Volcano in Jovis Fossae (Original NASA/MGS/MSSS b/w Frame)54 visiteCaption NASA originale:"This MGS-MOC image shows a small, dust-covered, volcano in the Jovis Fossae region of Mars. While Mars is known for its extremely large volcanoes, such as Olympus Mons, many small volcanoes also occur on the Red Planet, particularly in the Tharsis Region. This small volcano is a good example of those. It was originally found by members of the MGS Mars Orbiter Laser Altimeter (MOLA) team during the MGS primary mission. The volcano is old and cratered. Its surface is mantled by dust and its caldera (summit depression) has some dust-covered wind ripples on its floor".
Location near: 20,7° North and 111,3° West
Image width: ~3 Km (~1,9 mi)
Illumination from: lower left
Season: Northern Autumn
(5 voti)
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Craters-Unnamed_Crater_in_Amazonis_Planitia-M1101105.jpgUnnamed Crater in Amazonis Planitia (Original NASA/MGS/MSSS b/w Frame)55 visitenessun commento
(5 voti)
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South_Polar_Features-The_A_C__Trees-A-M0804688-01.jpgThe "Martian Trees" (Original NASA/MGS/MSSS b/w Frame - EDM)83 visitenessun commento
(5 voti)
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South_Polar_Features-The_A_C__Trees-A-M0804688-00.jpgThe "Martian Trees" (Original NASA/MGS/MSSS b/w Frame)75 visiteTanti commenti sono stati già fatti e non li ripetiamo. La curiosità che Vi segnaliamo, invece, è data dal nome attribuito a questi rilievi anomali dal Curatore del Sito MU: gli "Arthur Clarke Trees".
Un nome carino ed ingegnoso, anche se leggermente ambiguo (al pari, comunque, del grande Scrittore ed Autore, fra l'altro, della saga di "2001: A Space Odyssey" - 4 volumi - oltre che del meraviglioso, sebbene poco conosciuto, "Beyond the Fall of the Night").
(5 voti)
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Noachis_Terra-M0705535-02.jpgBizarre-looking Features of Southern Noachis Terra: the "Source of the Dark (pseudo) Lake" (EDM n.1, taken from the Original NASA/MGS/MSSS b/w M0705535 Frame)68 visiteSi tratta di semplici rocce stratificate alle quali, forse in ragione della loro composizione, si è associato un fenomeno di ossidazione, oppure si è effettivamente aperta una crepa sul margine di questo grande cratere e, dall'interno di quel 'crack' - come pare essere accaduto in altre zone di Marte - è fuoriuscito qualcosa di...indefinibile che, alla fine, si è raccolto sul fondo del cratere stesso?
Le immagini, in questo caso, sembrano chiare: provate a giudicare Voi stessi...
(5 voti)
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