Artistic Views of the Solar System |
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Meteor strike on Mars86 visteMars may have lost much of its atmosphere during asteroid impacts early in its history.
The Beagle 2 lander will look for signatures of life on Mars, whether long-dead or still-living, by measuring the ratio of two different types of carbon in the rocks. Biological processes on Earth favour the lighter isotope of carbon, carbon-12, over the heavier carbon-13. Hence, a high carbon-12 to carbon-13 ratio is taken as evidence of life and has been found in rocks up to 4 billion years old, even where geological processing has occurred. The hope is that the same occurred on Mars.
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Over the Walls of Endurance (1)...42 visteIpotesi di alba Marziana con il Sole capace di esprimere la stessa luminosità che è percepibile dalla Terra.
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Over the Walls of Endurance... (2)55 visteImmagine in cui il Sole, ora, esprime solo un terzo della luminosità percepibile dalla Terra. Notate una differenza?
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Aeneas Crater on Dione155 vistenessun commento
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The Aeroshell158 vistenessun commento
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8405 Asbolus108 visteThis is an artist's impression of object called 8405 Asbolus, a 48-mile-wide (about 80 Km) chunk of ice and dust that lies between Saturn and Uranus. Astronomers using NASA's HST were surprised to find that one side of the object (also called a Centaur) looks like it has a fresh crater less than 10 MY old, exposing bright underlying ice Hubble didn't directly see the crater - the object is too small and far away - but a measure of its surface composition shows a complex chemistry. The event that caused the impact crater on 8405 Asbolus may also have knocked it out of the Kuiper belt, a ring of comet nuclei just beyond Pluto's orbit.
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My "Day", your "Night"84 visteThough Earthlings will be able to get a good look at Mars during close approach, NASA's 2 Rovers on Mars will not be able to see Earth. That's because at the moment, Earth is on the daytime side of Mars. As shown in the top half of this artist's rendering, when it's nighttime on Earth, it's daytime on Mars. After Earth passes Mars, the Rovers will be able to see the sunlit side of Earth again just before dawn. The bottom half of this illustration shows what the Rovers would see if they looked toward Earth.
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Huygens Probe: en route to Titan85 visteThe Huygens Probe, after deploying from the Cassini Orbiter, en route into the murky atmosphere of Saturn's largest moon, Titan.
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A Frozen and yet active volcano on Enceladus153 visteUn vulcano (o magari un "geyser"?) ancora attivo sul corpo celeste più brillante dell'intero Sistema Solare: Encelado.
Un'intuizione, una 'licenza artistica' o magari un'imbeccata da parte di chi sa?!?
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Enceladus, Great Britain and Northern France102 visteSaturn's moon Enceladus is only 505 Km (approx. 314 miles) across, small enough to fit within the length of the United Kingdom, as illustrated here. The intriguing icy moon also could fit comfortably within Arizona or Colorado.
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Enceladian Geysers85 visteDa "NASA - Picture of the Day" dell'8 Giugno 2006:"In this stunning Saturnian vista - one in a series of artist's visions of volcanos on alien worlds - icy geysers erupt along narrow fractures in inner moon Enceladus. The majestic plumes were actually discovered by instruments on the Cassini Spacecraft during close encounters with bright and shiny Enceladus last year. Researchers now suspect the plumes originate from near-surface pockets of liquid water with temperatures near 273 kelvins (0° Celsius) - hot when compared to the distant moon's surface temperature of 73 kelvins (- 200° C). A dramatic sign that tiny, 500km-diameter Enceladus is surprisingly active, these ice volcanos hold out another potential site in the search for water and origin of life beyond planet Earth.
Enceladus' ice volcanos also likely produce Saturn's faint but extended E-Ring".
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Flash!!!87 visteThis image shows a flash produced in a laboratory by a high-velocity bead slamming into dust. Though the flash itself can't be resolved, its brilliant effects can be seen in this three-second time exposure. Scientists say that the collision between Deep Impact's Impactor and comet Tempel 1 may produce a similar flash.
This flash occurred when a quarter-inch sphere smashed into powdered dust at a speed of 6,4 Km-per-second (about 4 miles-per-second).
Even though the actual flash lasted less than 50 millionths of a second, the camera recorded the hot debris in the impact crater (center) and the streaking ejecta.
This experiment was performed at NASA's Ames Research Center, Moffett Field, Ca.
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