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00-Lunation.gifA full Lunar Cycle (Lunation)258 visiteDa "Astronomy: Picture of the Day", del 13 Novembre 2005:"Our Moon's appearance changes nightly. This time-lapse sequence shows what our Moon looks like during a lunation, such as a complete Lunar Cycle.
As the Moon orbits the Earth, the half illuminated by the Sun first becomes increasingly visible, then decreasingly visible. The Moon always keeps the same face toward the Earth and its apparent size changes slightly, though, and a slight wobble called "libration" is discernable as it progresses along its elliptical orbit.
During the cycle, sunlight reflects from the Moon at different angles and so illuminates different features differently. A full lunation takes about 29,5 days, such as just under a month (moon-th)".
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EnckeCometTailRipoff_movie_short.gifComet Encke encounters a CME54 visiteCaption NASA:"Swinging inside the orbit of Mercury, on April 20th, 2007, periodic comet Encke encountered a blast from the Sun in the form of a Coronal Mass Ejection (CME). When CMEs, enormous clouds of energetic particles ejected from the Sun, slam into Earth's magnetosphere, they often trigger auroral displays.
But in this case, the collison carried the tail of the comet away.
The tail was likely ripped off by interacting magnetic fields rather than the mechanical pressure of the collision.
This a GIF-movie showing the remarkable event as recorded by the Heliospheric Imager onboard the STEREO A spacecraft. In the movie, the time between frames is about 45 minutes, while the frames span about 14x20 MKM at the distance of the comet. Of course, similar collisions have happened before as the ancient comet loops through its 3,3 year solar orbit. So don't worry, Encke's tail will grow back!".MareKromium
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Milky_Way.gifSetting Milky Way53 visite"...Non c'รจ via che porti alla sopravvivenza cosciente dell'Anima, se non quella del lento, spesso doloroso, ma certo consapevole, abbandono delle cose terrene..."
P.C. Floegers - "Conversations for Tomorrow"
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Saturn-PIA09187.gifWatch the "Hexagon" rotate! (GIF-Movie)53 visiteThis nighttime movie of the depths of the North Pole of Saturn taken by the VIMS onboard NASA's Cassini Orbiter reveals a dynamic, active planet lurking underneath the ubiquitous cover of upper-level hazes. The defining feature of Saturn's North Polar Regions -- the six-sided hexagon feature -- is clearly visible in the image.
Here, brightness indicates the amount of 5-micron (seven times the wavelength visible to the human eye) radiation, or heat, generated in the depths of the warm interior of Saturn that escapes the planet. Clouds at a depth equivalent to 3-Earth-atmospheres pressure block the light radiating from below, revealing themselves in dark silhouette against the background thermal glow of the Planet. These deep clouds lie some 75 Km (about 47 miles) underneath the typical ammonia hazes and clouds seen in visual imagery and are likely composed of ammonia-hydrosulfide, although some may be composed of water, as on Earth.
A prominent feature seen in this polar view is a strange hexagon wave feature circumscribing the north pole.
This nighttime movie was acquired over a one-hour period on Nov. 10, 2006, from an average distance of 1.03 million kilometers (621,000 miles) above Saturn's clouds.
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SgrA_sharp_big.gifMovements near the Galaxy Center65 visiteCaption NASA originale:"Why are these stars moving so fast? Shown above is a time-lapse movie in infrared light detailing how stars in the central light-year of our Galaxy have moved over the past 8 years. The yellow mark at the image center represents the location of a peculiar radio source named Sagittarius A.
If these fast stars are held to the Galactic Center by gravity, then the central object exerting this gravity must be both compact and massive.
Analysis of the stellar motions indicates that over one million times the mass of our Sun is somehow confined to a region less than a fifth of a light-year across. Astronomers interpret these observations as strong evidence that the center of our Galaxy is home to a very massive black hole".
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