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The Rings-PIA08259.jpgGravitational Disturbances54 visiteCaption NASA originale:"The clumpy disturbed appearance of the brilliant F-Ring constantly changes. The irregular structure of the Ring is due, in large part, to the gravitational perturbations on the ring material by one of Saturn's moons, Prometheus (about 102 Km, or 63 miles across).

Interior to the F-Ring, the A-Ring bears a striking resemblance to a classic grooved, vinyl record. Visible here are the Keeler Gap (about 42 Km, or 26 miles wide) and the Encke Gap (about 325 Km, or 200 miles wide).

The image was taken using a spectral filter sensitive to wavelengths of infrared light centered at 862 nnmts. The view was acquired with the Cassini spacecraft narrow-angle camera on July 26, 2006 at a distance of approx. 1,5 MKM (about 900.000 miles) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 141°. Image scale is roughly 8 Km (such as about 5 miles) per pixel".

00-vg1_p20938.jpgJupiter, in true colors54 visiteUn nuovo viaggio in quelle che sono (ormai) le "Memorie dell'Astronautica".
Si tratta di Giove e del suo stupendo Sistema di lune, attraverso gli occhi di due grandissimi "Esploratori": le Sonde NASA, Voyager 1 e 2.

Voyager 1, il 15 Agosto 2006, ha raggiunto la (davvero "astronomica") distanza di 100 U.A. dal nostro Sole (o, se preferite, la distanza di circa 15 miliardi di Km dal Sole), confermandosi come l'oggetto fabbricato dall'Uomo "più distante" dal suo Mondo di origine.

Ecco un commento al riguardo da parte del Dr Edward Stone (ex Direttore del NASA JPL di Pasadena):"...what you can't predict is that the spacecraft isn’t going to wear out or break: Voyager 1 and 2 run 24 hours a day, 7 days a week, but they were built to last - Stone said.
The spacecrafts have really been put to the test during their nearly 30 years of space travel, flying by the outer planets, and enduring such challenges as the harsh radiation environment around Jupiter". - continua

03-vg1_p21181.jpgJupiter, in true colors54 visite"...NASA's twin Voyager spacecrafts are still beaming back new information about the final frontier of our Solar System, including evidence of "potholes" in the turbulent zone near the edge...".