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Inside_a_Red_Giant.jpgInside a "Red Giant"184 visiteCaption NASA:"A journey to the center of a Red Giant Star is very firmly in the realm of science fiction.
But the Science of Asteroseismology can explore the conditions there. The technique is to time the small variations in a star's brightness measured by the planet hunting Kepler Spacecraft. Regular variations indicate Stellar Oscillations, analogous to sound waves, that compress and decompress the gas causing brightness changes.
As recently discovered in Red Giant Stars, some of the Oscillations detected have periods that would cause them to penetrate to the Stellar Core. In that extreme environment they actually become more intense and can return to the Surface. These Echoes from the Red Giant's Core are illustrated in this frame from a computer generated animation. Remarkably, the periods measured for the Oscillations can even indicate how and where the Red Giant Star's energy production, by Hydrogen or Helium fusion, is taking place".MareKromium
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The_Rings-PIA12820.gifTilting Saturn's Rings (a Computer Animation by NASA/JPL/Cornell)154 visiteCaption NASA:"This animated graphic shows in a series of three images how Saturn's Rings, after they became tilted relative to Saturn's Equatorial Plane, would have transformed into a Corrugated Ring.
Images taken after Saturn's August 2009 equinox from NASA's Cassini Spacecraft revealed alternating light and dark bands extending from Saturn's D-Ring, completely across the C-Rg, and right up to the inner B-Rg Ege. These brightness variations are almost certainly caused by the changing slopes in the rippled Rng-Plane, much like the corrugations of a tin roof.
This series of images shows how such a vertical corrugation can be produced from an initially inclined ring by the natural tendency for inclined orbits to wobble systematically and slowly at different rates, depending on their distance from Saturn. The top image shows a simple inclined ring (the central planet is omitted for clarity), while the lower two images show the same ring at two later times, where the ring particles' wobbling orbits have sheared this inclined sheet into an increasingly tightly-wound spiral corrugation.
Cassini images show the corrugation extends for about 19.000 Km (11.799 miles). Based on detailed studies of this structure, scientists conclude that a broad swath of the Rings became suddenly tilted in the early 1980s, likely because Cometary Debris crashed into them.
The corrugation's radial extent implies that the impacting material was a dispersed cloud of debris instead of a single object. The corrugation's amplitude of about 2 to 20 meters (7 to 60 feet) indicates that the debris' total mass was around 1 Trillion Kg (or 1 Billion Metric Tons)".
MareKromium
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