| Piú viste - Mars, Deimos and Phobos: Maps |
018-Mars_Magnetic_Anomalies.jpgThe Magnetic Anomalies of Mars56 visiteThe Magnetic Anomalies found by the MAG/ER experiment on the Mars Global Surveyor spacecraft are inconveniently bisected by the 180° Longitude line, and so appear at both ends of the standard Mars Mercator Projection.
Here, the MAG/ER team have made hemispheric projections centered on the area of strongest anomalies.
The 3 hemispheres show the 3 components of the Magnetic Field: B(r) is the Radial Field, which is perpendicular to Mars' Surface; B(Θ) is the Polar Field, oriented along lines of Longitude; and B(Φ) is the Circumferential Field, oriented along lines of Latitude. MareKromium
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023-Mars_Water-2.jpgWhere is the "Water" of Mars? (Equatorial and Middle Latitude Regions)56 visiteA Neutron Spectrometer on the Mars Odyssey Spacecraft measures the abundances of neutrons of various energies emitted from Mars' Surface.
The ratio of low- to high-energy neutrons is a sensitive test of water abundances within a meter of Mars' surface.
There is LOTS of water. No one had expected any where near this much water near the Martian Surface.
All this is BETTER described in a press release from the Los Alamos National Laboratory, home of the Neutron Spectrometer and the scientists who run it (http://www.lanl.gov/news/releases/archive/03-101.shtml). MareKromium
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001-Mars.jpgMars, according to Schiaparelli56 visiteDal nostro Amico Roberto Tremolada, una bellissima (e "datata"!) Mappa del Pianeta Rosso realizzata dal Grande Schiaparelli.
E quindi, se volete VEDERE e SAPERE di più, Vi invitiamo a consultare la Sezione a Lui dedicata - ed intitolata "Per Ricordare" - dal bellissimo Sito Lunar Explorer Italia (Sez. Liguria e Piemonte), curato dal nostro Grandissimo Amico e Collega, il Dr Gianluigi Barca.
Vi basterà andare su http://www.lunarexplorer.it/, Sez. "Storia", sub-Sezione "Per Ricordare" e poi...Buona Lettura!MareKromium
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MARS-002.jpgMars in Time56 visiteCaption NASA, da "NASA - Picture of the Day" del 14 Luglio 2008:"Does Mars always appear the same? No.
As both Earth and Mars orbit the Sun, the apparent angular size of Mars changes as viewed from the Earth. Pictured above from Enschede, Holland, Mars was captured in 2007 and 2008 with 30 separate images, all taken with the same magnification.
When Earth and Mars are on opposite sides of the Sun, Mars appears relatively small. Conversely, when Earth and Mars are near each other, Mars looms large and bright. The largest Mars has appeared in recent history was the opposition of August 2003.
Since Mars is always more distant from the Earth from the Sun, Mars never shows a crescent phase to Earthlings. Visible also in the above images are the North Polar Cap of Mars, dark and light soil, clouds, and, in the early images, a Global Dust Storm.
The next opposition, when Earth again passes near to Mars, will occur in early 2010".MareKromium
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031-Mars-18-PIA09226_fig1.jpgThe "Upper Surface" of the Icy Layers Covering Mars' South Polar Region (Map 3)55 visiteThis map shows the topography of the South Polar Region of Mars. The data were collected by the Mars Orbiter Laser Altimeter aboard NASA's Mars Global Surveyor orbiter between 1997 and 2001. The elevation of the terrain is shown by colors, with purple and blue representing the lowest areas, and orange and red the highest. The total range of elevation shown is about 5 Km. The black line shows the boundary of the South Polar Layered Deposits, an ice-rich geologic unit that was probed by the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) aboard the European Space Agency's Mars Express orbiter.
The radar data indicate that the deposit is more than 3,7 Km (about 2,3 miles) thick in places, and that the material consists of nearly pure water ice, with only a small component of dust. The MARSIS team also determined that the total volume of ice in the layered deposits is equivalent to a water layer 11 mt (36 feet) deep, if spread evenly across the Planet. The boundary of the Layered Deposits was mapped by scientists from the U.S. Geological Survey. The dark circle in the upper center is the area poleward of 87° South Latitude, where MARSIS data cannot be collected.
The image covers an area of 1670 by 1800 Km (about 1035 by 1115 miles).
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029-Mars-16-PIA09224_fig1.jpgThe "Thickness" of Mars' South Polar Layered Deposits (Map 1)55 visiteThis map shows the thickness of the South Polar Layered Deposits of Mars, an ice-rich geologic unit that was probed by the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS). The MARSIS radar is an instrument on the European Space Agency's Mars Express orbiter. The thickness of the layered deposits was determined by measuring the time delay between radar echoes from the surface and those from the lower boundary, or "bed", of the deposits.
The radar data indicate that the deposit, larger than Texas in area, is more than 3,7 Km (about 2,3 miles) thick in places, and that the material consists of nearly pure water ice with only a small component of dust.
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O-Deimos_Map.jpgDeimos (credits: NASA - USGS)55 visitenessun commentoMareKromium
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017-Mars_Crustal_Magnetism.jpgMars Crustal Magnetism55 visiteThe Mars Global Surveyor spacecraft carried a Magnetometer, the MAG/ER.
During MGS's aerobraking procedure, the MAG/ER found that Mars does not have a global Magnetic Field like the Earth does, but large areas are strongly magnetic.
There are few good ideas of what this magnetism means, although plate tectonic processes do not seem likely. The area of Magnetic Anomalies seems to make a girdle around Mars, and this is (at least partly) because that's where MGS's orbit took it closest to Mars during aerobraking.MareKromium
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MARS-001.jpgMars from Hubble Space Telescope55 visiteThe Hubble Space Telescope has taken lovely images of Mars, which complement the MOC Atlas Mercator Projection. This image montage is from Mars' 1999 oppoxition.MareKromium
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021-Mars_Poles.jpgThe Poles of Mars55 visiteThe Mercator Projection distorts Polar Regions beyond recognition, so Polar Projection Maps are commonly made separately. These MOLA shaded topography images of Mars's North and South Polar Regions are stereographic projections, from Latitudes 72° N and S towards the respective Poles. The line of 0° Longitude is to the bottom of the North Pole images, and toward the top of the South Pole image.
Both Poles are covered by layered ice caps with smooth undulating surfaces. The North Polar Cap sits of a flat plain, while the South Polar Cap sits on heavily cratered land.MareKromium
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020-Mars_South_Pole.jpgThe South Pole of Mars (Mercator Projection - credits: NASA/MOLA)55 visitenessun commentoMareKromium
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019-North_Pole.jpgThe North Pole of Mars (Mercator Projection - credits: NASA/MOLA)55 visitenessun commentoMareKromium
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