| Risultati della ricerca nelle immagini - "others" |
060-Vesta_and_Friends-PIA14316.jpg4-Vesta and "Friends"...87 visiteCaption NASA:"This composite image shows the comparative sizes of 8 (eight) Asteroids. Up until now, Lutetia, with a diameter of about 81 miles (approx. 130 Km), was the largest Asteroid visited by a Spacecraft.
Vesta, which is also considered a protoplanet because it's a large body that almost became a planet, dwarfs all other small bodies in this image, with its diameter sizing up at approximately 330 miles (about 530 Km)".
MareKromium
|
|
Moons-EB.gifKnown and Unknown Saturnian Moons' Carousel... (GIF-Movie; credits: Elisabetta Bonora - Lunexit Team)63 visitenessun commentoMareKromium
|
|
Saturn-PIA10487.jpgMany Colors for Many Moons... (natural colors; credits: NASA)53 visiteCaption NASA:"Four moons huddle near Saturn's multi-hued disk.
The coloration of the planet's northern hemisphere has changed noticeably since the Cassini Spacecraft's arrival in orbit in mid-2004. Imaging scientists are working to understand the causes of this change, which is suspected to be a seasonal effect.
Giant Titan (5150 Km, or approx. 3200 miles across), with its darker Winter Hemisphere, dominates the smaller moons in the scene. Beneath and left of Titan is Janus (181 Km, or about 113 miles across). Mimas (397 Km, or approx. 247 miles across) appears as a bright dot close to the Planet and beneath the Rings. Prometheus (102 Km, or about 63 miles across) is a faint speck hugging the Rings between the two small moons.
This view looks toward the unilluminated side of the Rings from less than 1° above the Ring-Plane.
Images taken using red, green and blue spectral filters were combined to create this natural color view. The view was acquired with the Cassini spacecraft wide-angle camera on Oct. 26, 2007, at a distance of approx. 1,5 MKM (such as about 920.000 miles) from Saturn and 2,7 MKM (about 1,7 MMs) from Titan.
Image scale is roughly 89 Km (approx. 55 miles) per pixel on Saturn and 164 Km (about 102 miles) per pixel on Titan".MareKromium
|
|
Saturn-RingPlane_cassini_big.jpgAlong the Ring-Plane of Saturn (natural colors; credits: NASA)53 visiteCaption NASA originale:"When Saturn's appendages disappeared in 1612, Galileo did not understand why. Later that century, it became understood that Saturn's unusual protrusions were Rings and that when the Earth crosses the Ring-Plane, the edge-on rings will appear to disappear.
This is because Saturn's Rings are confined to a plane many times thinner, in proportion, than a razor blade. In modern times, the Cassini Spacecraft orbiting Saturn now also crosses Saturn's Ring-Plane. A series of plane crossing images from late February (2006) was dug out of the vast online Cassini raw image archive by interested Spanish amateur Fernando Garcia Navarro.
Pictured above, digitally cropped and set in representative colors, is the striking result. Saturn's thin Ring-Plane appears in blue, bands and clouds in Saturn's Upper Atmosphere appear in gold and dark shadows of the Rings curve across the top of the Gas Giant Planet. Moons appear as bumps in the Rings". MareKromium
|
|
ZZ-Mercury-Craters-Balzac_Crater_and_others-PIA16907-PCF-LXTT-IPF.jpgCraters' Variety (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga/Lunar Explorer Italia/Italian Planetary Foundation)99 visiteThis oblique view of the Surface of Mercury highlights, from top to bottom, the Impact Craters Balzac, Phidias,Tyagaraja, Stevenson, and Zeami. While named Impact Craters are still sparse across much of the Surface of Mercury, this Region, since it had already been observed by the NASA - Mariner 10 Spacecraft, granted to Planetary Scientists and Researchers plenty of time to propose names to the International Astronomical Union (or IAU, for short) and get them approved. Furthermore, in the NASA - Mariner 10 images of Mercury, Craters like Tyagaraja (located at the center of the image and having a diameter of approx. 97 Km - such as about 60,2 miles) and Zeami were described as hosting "Bright Floor Deposits", but the relatively low resolution at which they were imaged at that time did not allow the Planetary Scientists to carry out a more detailed analysis.
Now, thanks to the imaging capabilities of the cameras onboard the NASA - MESSENGER Spacecraft, we know that the Mercurian Impact Craters such as these visible in today's APOD, actually do not host "Bright Floor Deposits" but rather that fascinating (and still far from being fully understood) Features known as "Hollows".
Date acquired: November, 26th, 2012
Images Mission Elapsed Time (MET): 262401199, 262401219, 262401203
Images ID: 3026482, 3026487, 3026483
Instrument: Wide Angle Camera (WAC) of the Mercury Dual Imaging System (MDIS)
Center Latitude: 4,64° North
Center Longitude: 210,50° East
Resolution: 698 meters/pixel
Solar Incidence Angle: 30,2° (meaning that the Sun, at the time that the picture was taken, was about 59,8° above the imaged Local Mercurian Horizon)
Emission Angle: 57,5°
Sun-Mercury-Messenger (or "Phase") Angle: 83,8°
This picture (which is an Original NASA - MESSENGER Spacecraft false color image-mosaic published on the NASA - Planetary Photojournal with the ID n. PIA 16907) has been additionally processed and then re-colorized in Absolute Natural Colors (such as the colors that a human eye would actually perceive if someone were onboard the NASA - MESSENGER Spacecraft and then looked down, towards the Surface of Mercury), by using an original technique created - and, in time, dramatically improved - by the Lunar Explorer Italia Team. Different colors, as well as different shades of the same color, mean, among other things, the existence of different Elements (Minerals) present on the Surface of Mercury, each having a different Albedo (---> Reflectivity) and Chemical Composition.MareKromium
|
|
|
|
|
| 5 immagini su 1 pagina(e) |
|
