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File:Alpha Centauri AB over limb of Saturn PIA10406.jpg

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The nearest star system, the trinary star Alpha Centauri, hangs above the horizon of Saturn. Both Alpha Centauri A and B—stars very similar to our own—are clearly distinguishable in this image. (The third star in the Alpha Centauri system, the red dwarf Proxima Centauri, is not visible here.) From the orbit of Saturn, light (as well as Cassini's radio signal) takes a little more than an hour travel to Earth. The distance to Alpha Centauri is so great that light from these stars takes more than four years to reach our Solar System. Thus, although Saturn seems a distant frontier, the nearest star is almost 30,000 times farther away. This image is part of a stellar occultation sequence, during which Cassini watches as a star (or stars) as it passes behind Saturn. Light from the stars is attenuated by the uppermost reaches of Saturn's gaseous envelope, revealing information about the structure and composition of the planet's atmosphere. The view was captured from about 66 degrees above the ringplane and faces southward on Saturn. Ring shadows mask the planet's northern latitudes at bottom.

The image was taken in visible red light with the Cassini spacecraft narrow-angle camera on May 17, 2008. The view was obtained at a distance of approximately 534,000 kilometers (332,000 miles) from Saturn. Image scale on Saturn is about 3 kilometers (2 miles) per pixel.
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http://photojournal.jpl.nasa.gov/catalog/PIA10406

作者 NASA/JPL/Space Science Institute
本图像或视频收录于美国国家航空航天局 (NASA)喷气推进实验室(Jet Propulsion Laboratory),其照片编号是: PIA10406

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  • 2008-06-20 12:31 Kwamikagami 1017×477×8 (17057 bytes) {{Information |Description= Original Caption Released with Image: The nearest star system, the trinary star Alpha Centauri, hangs above the horizon of Saturn. Both Alpha Centauri A and B—stars very similar to our own—are clearly distinguishable in th

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当前2019年4月26日 (五) 14:202019年4月26日 (五) 14:20版本的缩略图1,017 × 477(84 KB)FriedrichKiefererBetter quality.
2008年6月20日 (五) 16:092008年6月20日 (五) 16:09版本的缩略图1,017 × 477(17 KB)FrancescoA{{Information |Description={{en|Original Caption Released with Image: The nearest star system, the trinary star Alpha Centauri, hangs above the horizon of Saturn. Both Alpha Centauri A and B—stars very similar to our own—are clearly distinguishable in

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