| Piú votate |
B-Mercury-PIA02414.jpgMercury or the Moon?58 visiteCaption NASA originale:"After passing Mercury the first time and making a trip around the Sun, Mariner 10 again flew by Mercury on September 21, 1974, at 1:59 PMPDT. This encounter brought the spacecraft in front of Mercury in the Southern Hemisphere.
Much of Mercury looks like the lunar highlands, a scene carved by billions of years of impact craters. This image (FDS 166724)was taken when Mariner 10 was near its closest approach to the planet during the second encounter, from about 50.000 Km. This image is found near the center of the area not imaged during the first encounter".
(12 voti)
|
|
Titan-Huygens_Landing_Site-11-PIA07229_modest.jpgHuygens' descent map (3) 57 visiteThe octagons indicate anticipated fields of view of panoramic mosaics of images taken by Huygens' descent imager and spectral radiometer instrument as the probe reaches certain altitudes during its descent. This map shows the footprints for mosaics to be assembled from 36 individual images at each altitude, with the field of view cut off at 75° from straight down although the actual images will extend all the way to the hazy horizon. Each mosaic made this way will be about 1.300 by 1.300 pixels. The largest octagon (in red) is about 1.120 Km across and represents the field of view for the mosaic of images taken at an altitude of 150 Km. From that height, individual pixels in the center of the image will be about 150 mts across, though haze between the ground and the camera at that height will likely degrade the resolution in those images. The location of the anticipated landing site is based on modeling of Titan's winds, and the actual landing site will be different if the actual winds experienced by Huygens during descent differ from this model.
(12 voti)
|
|
APOLLO 12 AS 12-49-7318~0.jpgAS 12-49-7318 - Pete Conrad among Moon rocks166 visiteBean took this picture of Conrad from the north during a stop at the south rim of Surveyor Crater. Note the large blocks that have been dug up by the small impact at Pete's right. The Handtool Carrier (HTC) is forward of his left foot. He is holding a scoop in his right hand and the gnomon is on the ground in front of his right foot.
(12 voti)
|
|
OPP-SOL319-1N156505959EFF3981P0705R0M1.jpgMeridiani Planum panorama on Sol 319 (1)65 visitenessun commento
(12 voti)
|
|
Titan-PIA06996_modest.jpgDoes Titan have a so-called "weather-pattern"?55 visiteIn the first image (left), obtained on the 1st Titan flyby, from a distance of 200.000 Km, Titan's skies are cloud-free, except for a patch of clouds observed over the South Pole near the bottom of the image. In contrast, the image on the right shows a recent view of this same area of Titan obtained 7 weeks later on the 2nd close Titan flyby, from a distance of 225.000 Km. This image clearly shows that several extensive patches of clouds have formed over temperate latitudes. The appearance of these clouds reveals the existence of weather. Tracking these features is currently underway by scientists, who hope to gain a better understanding of global circulation, regional weather patterns and localized meteorology in Titan's skies. The red color images the surface at a wavelength (2.01 micron) where the surface is relatively bright, making the surface appear reddish in these color images. The green color (2.83 micron) images the surface as well, but due to enhanced absorption of sunlight by the surface and lower atmosphere, the surface is relatively dark here compared to the red. The blue color (2.13 micron) is at a wavelength where sunlight cannot reach the surface at all due to strong absorption by the atmospheric gas methane. In contrast to the reddish surface, bright clouds at a relatively high altitude (here, about 30 kilometers (19 miles) above the ground) residing above most of the atmospheric absorption appear whitish in these representations, as they reflect sunlight effectively in all three near-infrared colors.
(12 voti)
|
|
P-OPP-SOL310-1P155690245EFF38EVP2621L5M1.jpgSunrise with bright light near the Sun (2)157 visitevedi commento al frame che precede
(12 voti)
|
|
Mimas-PIA06142_modest.jpgMimas and Saturn in real colors62 visiteCaption NASA originale:"In a splendid portrait created by light and gravity, Saturn's lonely moon Mimas is seen against the cool, blue-streaked backdrop of Saturn's northern hemisphere. Delicate shadows cast by the rings arc gracefully across the planet, fading into darkness on Saturn's night side. The bright blue swath near Mimas is created by sunlight passing through the Cassini division (4.800 Km wide). The rightmost part of this distinctive feature is slightly overexposed and therefore bright white in this image. Shadows of several thin ringlets within the division can be seen here as well. The dark band that stretches across the center of the image is the shadow of Saturn's B-Ring, the densest of the main rings. Part of the actual Cassini division appears at the bottom, along with the A-Ring and the narrow, outer F-Ring. The A-Ring is transparent enough that, from this viewing angle, the atmosphere and threadlike shadows cast by the inner C-Ring are visible through it".
(12 voti)
|
|
ZZ-Z-Taurus Littrow.jpgTaurus Littrow - Mission Overview151 visiteApollo 17 (CSM America and LM Challenger)
Saturn V
December 07-19, 1972
Eugene A. Cernan
Ronald E. Evans
Harrison H. "Jack" Schmitt
12 days, 13 hours, 52 minutes
Last lunar landing mission.
Landing site:
Taurus-Littrow, highlands and valley area.
Landing Coordinates: 20.18809 degrees North, 30.77475 degrees East
(Source: National Space Science Data Center)
3 EVAs of 22 hours, 04 minutes. First scientist-astronaut to land on Moon, Schmitt. Sixth automated research station set up. LRV traverse total 30.5 km. 110.4 kg (243 lbs) of material gathered. Lunar surface stay-time, 75 hours. (CSM) in lunar orbit 148 hours. Evans performed trans-Earth EVA lasting 01 hour 06 minutes.
(12 voti)
|
|
Mars Odyssey.jpgMars Odyssey87 visiteDa "NASA - Picture of the Day" del 25.10.2001:"After an interplanetary journey lasting 200 days, the Mars Odyssey spacecraft has entered orbit around the Red Planet on October, 25, 2001. This success is welcome as in the past Mars has often seemed a difficult planet to visit. Beginning with the first Soviet attempts in 1960, around 30 missions have tried while only 10 or so have gone without serious mishap (...) Cautiously dipping into the Martian atmosphere, the spacecraft will gradually adjust its present wide and elliptical 20-hour orbit to a circular 2-hour orbit only 400 Km above the planet's surface. Then, its instruments and cameras will focus on exploring the climate and geologic history of Mars, including the search for water and evidence of life-sustaining environments. In the artist's conception above, the spacecraft with wing-like solar panels is imagined firing its rocket engine for Mars orbit insertion over terrain seen in natural and false-color".
(12 voti)
|
|
ZZ-Z-Temp. at Bonn. Crat..jpgTemperatures at Bonneville Crater during the Martian Day229 visiteUna mappatura delle temperature approssimative del Cratere Bonneville a diverse ore del giorno. E' un documento da leggere in relazione a quanto visto sia a proposito delle temperature medie di Marte, sia con riguardo ad una simile mappatura fatta per il Cratere Endurance. EccoVi una porzione della caption NASA originale:"...The times of the subsequent frames are 11:49 a.m., 1:35, 2:35 and 4:39 p.m. In this color-coded map, quicker reddening during the day suggests sand or dust. (Red is about 270 Kelvin or 27 deg. Fahrenheit or approx. -3° C). An example of this is in the shallow depression in the right foreground. Areas that stay blue longer into the day have larger rocks. (Blue indicates about 230 Kelvin or -45 deg. Fahrenheit)...".
(12 voti)
|
|
The limb of the Sun.jpgThe limb of the Sun64 visiteFotografia amatoriale della corona solare durante l'ultima grande eclissi totale del 1999.
(12 voti)
|
|
EROS-PIA03143.jpgEros: NEAR-Shoemaker's Probe landing site78 visiteThe location of NEAR Shoemaker's landing site is shown in this image mosaic taken on December 3, 2000, from an orbital altitude of about 200 Km (approx. 124 miles). In this view, south is to the top and the terminator (the imaginary line dividing day from night) lies near the equator. The landing site (at the tip of the arrow) is near the boundary of two distinctly different provinces, both of which the spacecraft will photograph as it descends. To the south and east (above and to the left) lies older, cratered terrain, while to the north (down) is the saddle-shaped feature Himeros, whose lesser density of superposed craters indicates relatively recent resurfacing by geologic processes.
(12 voti)
|
|
| 25332 immagini su 2111 pagina(e) |
 |
|
|
|
|
2086 | |
|
|
|
|
