| |
|
|
|
|
|
|
|
|
|
|
|
|
| 20 album su 2 pagina(e) |
2 |
|
| Immagini a caso - SOLAR SYSTEM |
Triton-PIA01536_modest.jpgTriton (through green, violet and ultraviolet filters)72 visiteCaption NASA originale:"This color photo of Neptune's large satellite Triton was obtained on Aug. 24 1989 at a range of 530.000 Km (or 330.000 miles). The resolution is about 10 Km (6,2 miles), sufficient to begin to show topographic detail. The image was made from pictures taken through the green, violet and ultraviolet filters. In this technique, regions that are highly reflective in the ultraviolet appear blue in color. In reality, there is no part of Triton that would appear blue to the eye. The bright southern hemisphere of Triton, which fills most of this frame, is generally pink in tone as is the even brighter equatorial band. The darker regions north of the equator also tend to be pink or reddish in color".
|
|
Tethys-N00143887-N00143908.gifSpace Speedway (GIF-Movie; credits: Dr G. Barca)63 visitenessun commentoMareKromium
|
|
TRITON.jpgTriton from Voyager 2 (enhanced real colors)119 visiteLa superficie di Tritone, come ripresa dal Voyager 2, in colori reali ma con esaltazione dei contrasti.
Canali, crepacci, montagne e grandi crateri da impatto sono facilmente visibili, al pari di una strana distesa semi-pianeggiante che interrompe nettamente e bruscamente il paesaggio del pianeta, facendolo passare dall'estremamente accidentato e montuoso al (relativamente) liscio e pianeggiante. Forse questo paesaggio cos affascinante ed "alieno" il prodotto di eventi sismici aventi carattere planetario e risalenti alla "giovent" del corpo celeste.
|
|
Dione-N00119790.jpgCross-Worlds! (6)68 visitenessun commentoMareKromium
|
|
Enceladus-N00036994.jpgEnceladus fly-by (8) - from approx. 52.000 Km65 visitenessun commento
|
|
Tethys-Mimas-EB.jpgSaturnian Twins: Tethys and Mimas (Natural Colors - Image-Mosaic; credits: Elisabetta Bonora - Lunexit Team)79 visitenessun commentoMareKromium
|
|
Titan-Clouds-White_Clouds-PIA08736.jpgThe "White Clouds" of Titan64 visiteCaption NASA originale:"This image depicts Saturn's moon Titan as seen by the Visual and Infrared Mapping Spectrometer (VIMS) after the closest approach of July 22, 2006 (fly-by n. 16).
The image was generated using the 5 micron wavelength for red, the 2 micron wavelength for green and the 1,2 micron wavelength for blue. The clouds are of the same type seen previously and reported in the journal "Science".
The image shows the clouds spreading out along the 40 South Latitude line.
This image was taken from a distance of about 160.000 Km (roughly 99.000 miles) from Titan".
|
|
Jupiter-PIA22948.jpgJupiter Abyss...196 visiteCaption NASA Originale:"NASA's Juno spacecraft captured this view of an area within a Jovian jet stream showing a vortex that has an intensely dark center. Nearby, other features display bright, high altitude clouds that have puffed up into the sunlight.
The color-enhanced image was taken at 12:55 a.m. PDT (3:55 a.m. EDT) on May 29, 2019, as the spacecraft performed its 20th science fly-by of Jupiter. At the time, Juno was about 9.200 miles (approx. 14.805,96 Km) from the Planet's cloud tops, above approximately 52 North Latitude.
Citizen scientists Gerald Eichstdt and Sen Doran created and named this image using data from the spacecraft's JunoCam imager".MareKromium
|
|
| Ultimi arrivi - SOLAR SYSTEM |
Europa-Crater_and_Ridges.jpgPwyil Crater - Europa200 visiteThe large Jovian moon Europa may harbor liquid water beneath its frozen crust. Controversy surrounding this idea has been recently fueled by dramatic images of Europa's surface from the Galileo spacecraft.
This alluring color image was produced by combining low resolution color data with higher resolution mosaics recorded during three separate flybys and covers about 120 by 150 miles.
The eerie terrain of grooved linear ridges and crustal plates which seem to have broken apart and rafted into new positions could indicate subsurface water or slush. Blue tints represent relatively old ice surfaces while reddish regions may contain material from more recent internal geological activity.
White splotches are bright material blasted from the young impact crater Pwyll located about 600 miles south (to the right) of this area.
Many believe that large reservoirs of water hold out the tantalizing possibility of organisms living on this dim, distant world.MareKromiumAgo 19, 2026
|
|
Uranus_and_clouds-ESA-Hubble~0.jpgUranus, from the HST197 visiteThe strongly inclined cloud-bands are well visible even here.
Studying Uranus "up close" is one of the next goals of space exploration. This is reiterated by Kathleen Mandt, a planetary scientist at the Johns Hopkins University Applied Physics Laboratory.
According to a paper published in Science, she argues that NASA should send a probe exclusively to Uranus relatively quickly. Astronomers have indeed studied Mars extensively, both because of its close proximity to Earth and because it has a solid surface on which it is possible to land. However, Mandt believes this approach is flawed.
Although planets with very dense atmospheres are more difficult to study because they lack a surface on which rovers can walk, studying them is essential to understanding their characteristics. And, according to Mandt, we should also act quickly, given that the next "best launch window" would be 2032, when the alignment between Jupiter and Earth will allow a gravitational slingshot to the planet.MareKromiumAgo 18, 2026
|
|
Uranus_clouds_and_rings.jpgUranus' Rings and clouds207 visiteLook carefully at the tilt of Uranus's rotation axis. It actually orbits the Sun, but, as some say, it does so by rolling on its axis.
What could have happened, hundreds of millions or billions of years ago, to shift Uranus's rotation axis this way? Many say: an impact.
Perhaps. But some traces should have remained and be still visible (it would have been an enormous scar). Perhaps the fragmented rings are a little evidence of such a catastrophe (arcs of broken rings that, perhaps, once formed a structure not as majestic as Saturn's, but at least complete)... But the truth is that nobody knows.MareKromiumAgo 18, 2026
|
|
Sun_Flowers_NSO_1901.jpgFunny-looking Sun149 visiteIs that the Surface of the Sun? Yes it is, believe it or not...MareKromiumAgo 17, 2026
|
|
Saturnian_Spokes.gifSpokes on Saturn's B-Ring (Image Credit & Copyright: Brad Croslin)158 visiteThis GIF-Movie features a nearly two-hour timelapse of Saturn and its rings looping forwards and backwards. If you look closely, a ghoulish shadow appears and disappears as Saturn’s B-Ring rotates.
Decades of observation with Voyager 2, Cassini, and Hubble show the appearance of Saturn’s spokes varies with the planet’s seasons. Like Earth, Saturn’s spin axis is tilted compared to the plane of its orbit around the Sun.
During Saturn’s Equinox, the rings are less tilted toward the Sun and they receive sunlight at a shallower angle. Saturn’s spokes may be electrically charged dust and ice temporarily levitated above the rings by electromagnetic forces.
It is still uncertain, but the ring plasma and charge environment may be influenced by changing ultraviolet illumination, meteoroid impacts, or indirect effects from interactions between the solar wind and the planet’s magnetic field.MareKromiumAgo 09, 2026
|
|
Torifune_JAXA_1400.jpgDouble Asteroid "Torifune" (Credits: JAXA, U. of Tokyo, Chiba Tech, Tokyo U. of Science, AIST, Paris Obs., IAC)127 visiteWhy is this asteroid a double? Earlier this month the Japanese robotic spacecraft Hayabusa2 shot past asteroid 98943 Torifune and captured pictures. Although previous observations from distant Earth indicated that Torifune was oblong, Hayabusa2 found that Torifune actually has two joined lobes. With a length of about four soccer fields, this space rock frequently comes near the Earth as it orbits the Sun, although it is not a threat. Besides the two lobes, Torifune shows many large boulders, but, surprisingly, no obvious craters, likely because its surface is a pile of rubble. Like asteroid Arrokoth, it appears that each lobe formed separately before colliding and becoming stuck together. Hayabusa2 famously encountered asteroid Ryugu in 2018, and now heads for an encounter in 2031 with 1998 KY26, a smaller asteroid that rotates unusually fast and might have reservoirs of ice. Torifune translates literally to "bird boat" in Japanese. It primarily refers to Ame-no-torifune (Heavenly Bird Boat), a deity and his a deity and his magical vessel in Japanese mythology capable of traveling at high speeds with the steadiness of a rock.MareKromiumLug 15, 2026
|
|
Pluto_from_above.pngPluto from above (Image Credit: NASA, Johns Hopkins Univ./APL, Southwest Research Inst.)144 visiteA 50 mile (80 kilometer) trip across Pluto would cover the distance indicated by the scale bar in this startling image. The close-up of the icy world's rugged equatorial terrain was captured when the New Horizons spacecraft was about 47,800 miles (77,000 kilometers) from the surface, 1.5 hours before its closest approach. Rising to an estimated 11,000 feet (3,500 meters) the mountains are likely composed of water ice. Suggesting surprising geological activity, they are also likely young with an estimated age of 100 million years or so based on the apparent absence of craters. The region pictured is near the base of Pluto's broad, bright, heart-shaped feature.MareKromiumLug 02, 2026
|
|
ZZ-Mercury-Gravity_MESSENGER_960.jpgGravitational Anomalies of Mercury (Image Credit: NASA, GSFC's SVS, JHU's APL, Carnegie Inst. Washington)159 visiteWhat's that under the surface of Mercury? The robotic MESSENGER spacecraft that had been orbiting planet Mercury for the past four years had been transmitting its data back to Earth with radio waves of very precise energy. The planet's gravity, however, slightly changed this energy when measured on Earth, which enabled the reconstruction of a gravity map of unprecedented precision. Here gravitational anomalies are shown in false-color, superposed on an image of the planet's cratered surface. Red hues indicate areas of slightly higher gravity, which in turn indicates areas that must have unusually dense matter under the surface. The central area is Caloris Basin, a huge impact feature measuring about 1,500 kilometers across. Last week, after completing its mission and running low on fuel, MESSENGER was purposely crashed onto Mercury's surface.MareKromiumLug 02, 2026
|
|
|
|
