| Ultimi arrivi - A Tribute To Mars Global Surveyor |
Martian_Eclipse-moc2_msss_3shadow100-00.jpgMOC Views of Martian Solar Eclipses (Original NASA/MGS/MSSS b/w Frame)102 visiteThe shadow of the martian moon, Phobos, has been captured in many recent wide angle camera views of the red planet obtained by the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC). Designed to monitor changes in weather and surface conditions, the wide angle cameras are also proving to be a good way to spot the frequent solar eclipses caused by the passage of Phobos between Mars and the Sun.This picture shows three samples of MOC's global image swaths, each in this case with a shadow of Phobos visible (arrow). The first scene (left) was taken on September 1, 1999 and shows the shadow of Phobos cast upon southern Elysium Planitia. The large crater with dark markings on its floor at the lower right corner is Herschel Basin. The second scene shows the shadow of Phobos cast upon northern Lunae Planum on September 8, 1999. Kasei Valles dominates the upper right and the deep chasms of Valles Marineris dominate the lower third of the September 8 image. The picture on the right shows the shadow of Phobos near the giant volcano, Olympus Mons (upper left), on September 25, 1999. Three other major volcanoes are visible from lower-center (Arsia Mons) and right-center (Pavonis Mons) to upper-middle-right (Ascraeus Mons).Gen 01, 2005
|
|
Craters-Crater_Cluster-Meridiani_Planum-PIA07151_modest-00.jpgCrater Cluster in Meridiani Planum (Original NASA/MGS/MSSS b/w Frame)118 visiteUna piccola porzione di Meridiani Planum, caratterizzata da un grande ed antico cratere (in alto) e da una moltitudine di crateri più piccoli che tanto ci ricordano il Cratere Endurance. certo, sarebbe bello andare a dare un'occhiata a questo strano paesaggio dal basso ma...Opportunity è troppo lontana e, in questa zona, quasi certamente, non ci arriverà mai.
Ma poi, in fondo, chissà...Dic 29, 2004
|
|
Phobos-Phobos_Monolith-00.jpgThe "Phobos' Monolith" (CTX Frame)295 visitenessun commentoNov 15, 2004
|
|
Earth_and_Moon_from_Mars-01.jpg"Us", from Mars (EDM)95 visitevedi il commento al frame precedenteNov 10, 2004
|
|
Earth_and_Moon_from_Mars-00.jpgEarth and Moon from Mars93 visiteCaption originale:"This is the first image of Earth ever taken from another planet that actually shows our home as a planetary disk. Because Earth and the Moon are closer to the Sun than Mars, they exhibit phases, just as the Moon, Venus, and Mercury do when viewed from Earth. As seen from Mars by MGS on 8 May 2003, Earth and the Moon appeared in the evening sky. The MOC Earth/Moon image has been specially processed to allow both Earth (with an apparent magnitude of -2.5) and the much darker Moon (with an apparent magnitude of +0.9) to be visible together. The bright area at the top of the image of Earth is cloud cover over central and eastern North America. Below that, a darker area includes Central America and the Gulf of Mexico. The bright feature near the center-right of the crescent Earth consists of clouds over northern South America. The image also shows the Earth-facing hemisphere of the Moon, since the Moon was on the far side of Earth as viewed from Mars.The slightly lighter tone of the lower portion of the image of the Moon results from the large and conspicuous ray system associated with the crater Tycho.Nov 10, 2004
|
|
Martian_Limb-MGS-E23-00100_limb-01.jpgMartian Limb, Clouds, Haze and Outer Space (Original NASA/MGS/MSSS b/w Frame)129 visiteCaption originale:"Mars Global Surveyor orbits the Red Planet 12 times each day. Half of each orbit is spent on the day side of Mars, which is where most Mars Orbiter Camera images are obtained because sunlight is required to illuminate the Surfaces being observed. However, on the night side of Mars, the wide angle cameras can see clouds and hazes above the sunward Martian Limb. This blue wide angle camera image, obtained on the night side of Mars on May 15, 2003, shows Clouds picking up the first sunlight before dawn near 55° North Latitude. The scene is illuminated by sunlight from the right. The Sun is actually on the other side of the Planet and has not yet risen over this Region. The dark area on the left side of the picture is the Martian Surface at night. The dark band on the right side is Outer Space. The bright features just right of center are the Clouds hanging above the Martian Limb over Mars' Northern Plains. North is up and the Spacecraft was moving Southward when the image was acquired".Nov 10, 2004
|
|
Martian_Limb-MGS-E23-00100_limb-00.jpgMartian Limb and Outer Space (Original NASA/MGS/MSSS b/w Frame)167 visitecaption originale: "The Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) red and blue wide angle cameras provide daily coverage of the Red Planet "from Limb to Limb." The "Limbs" are the edges of the Planet as seen to the West and East of the spacecraft. Depending on weather conditions, Clouds or Haze can sometimes be seen above the Limb. This picture was taken by the blue camera in December 2002. It is an oblique view looking Westward across heavily Cratered Terrain at High Southern Latitudes. A thin line of Haze, high in the Martian Atmosphere, can be seen above the Planet's Surface. The view of Craters in the foreground is enhanced by the presence of bright, winter-time CO2 Frost. The darkness above the Limb is outer space".Nov 10, 2004
|
|
Martian_Mountains-MGS-02.jpgCharitum Montes (Natural Colors; credits: NASA/MGS/MSSS)152 visitenessun commentoNov 10, 2004
|
|
Martian_Mountains-MGS-01.jpgCharitum Montes (Natural Colors; credits: NASA/MGS/MSSS)134 visiteCaption originale: "This is a perspective view of the Charitum Montes, the Mountain Range that bounds Southern Argyre Planitia, created by combining red and blue Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) wide angle images with topography from the MGS Mars Orbiter Laser Altimeter (MOLA). Carbon dioxide frost coats some of the hills, craters, and mountainsides in this southern springtime image. The picture is located near 57° South Lat. and 43°West Long. North is toward the top, South toward the bottom. Sunlight illuminates the scene from the upper left. The area shown is about 355 Km. A smaller portion of this image was previously released in July 2003 as "Frosty Mountains." Nov 10, 2004
|
|
Craters-Newton_Crater-03.jpgNewton Crater's Gullies (Original NASA/MGS/MSSS b/w Frame)168 visiteDa "NASA - Picture of the Day" del 26.6.2000:"...Inside a small crater that lies inside large Newton Crater on Mars, numerous narrow channels run from the top down to the crater floor. The above picture covers a region spanning about 3000 meters across. These and other gullies have been found on Mars in recent HR pictures taken by the orbiting Mars Global Surveyor robot spacecraft. Similar channels on Earth are formed by flowing water, but on Mars the temperature is normally too cold and the atmosphere too thin to sustain liquid water. Nevertheless, many scientists now hypothesize that liquid water did burst out here from underground Mars, eroded the gullies and pooled at the bottom as it froze and evaporated. If so, life-sustaining ice and water might exist even today below the Martian surface (...)". L'idea che ci sia acqua allo stato liquido sotto la superficie di Marte non è nuova, anzi: la NASA stessa lo ipotizzava 4 anni fa. Oggi, dopo mesi di esplorazione "in loco", tutto tace. Forse un ripensamento?Ott 30, 2004
|
|
Craters-Galle_Crater-Happy_Face_Crater-MGS-2.jpgGalle Crater (Saturated Natural Colors; credits: NASA/MGS/MSSS)106 visiteIl nome che è stato dato al cratere qui ripreso dal Mars Global Surveyor spiega già tutto: da questa angolazione, infatti, si potrebbe dire che un dotato burlone sia andato a disegnare un bel "viso sorridente" sulla superficie di Marte. Ovviamente si tratta di un semplice effetto ottico determinato dalla particolare prospettiva in cui si trovava la Sonda rispetto al cratere nel momento della ripresa.
Eppure - credeteci! - c'è stato qualcuno che ha pensato che questa "Faccia Felice" fosse un altro degli enigmatici "Monumenti di Marte", dopo la Sfinge e le Piramidi di Cydonia Mensae.Ott 18, 2004
|
|
Hellas_Planitia.jpgHellas Planitia in Winter (Natural Colors; credits: NASA/MGS/MSSS)126 visite"This picture captures two dust storms, each large enough to cover Arizona or New Mexico. One is located near the lower left, the other at the lower right. 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. The strong temperature difference between the winter frost and the warmer air just off the edge of this Polar Cap generates winds that - at this time of year - are often strong enough to lift Dust into large, reddish-brown, billowy clouds".Ott 07, 2004
|
|
| 512 immagini su 43 pagina(e) |
 |
|
|
|
|
|
|
|
41 | |
|
