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2012.6.17『木星的光环』#APOD同步#

为什么木星有光环？木星的光环在1979年被驶过木星的旅行者1号太空探测器发现，但是它的来源是个谜。经1995年至2003年环绕木星的伽利略号探测器上的数据证实，这些光环是由陨石撞击木星附近的小行星产生的。例如，当一个小陨石撞击木卫十五（Adrastea，朱庇特的女儿，木星的名字是朱庇特）的时候，它会并入卫星，汽化，爆发尘土进木星轨道。上图是伽利略号探测器拍摄到的木星日食。在木星大气高处的细微的灰尘颗粒，和组成光环的灰尘颗粒，被太阳光反射，显现在图中。

Why does Jupiter have rings? Jupiter's rings were discovered in 1979 by the passingVoyager 1 spacecraft, but their origin was a mystery. Data from the Galileo spacecraft that orbitedJupiter from 1995 to 2003 later confirmed that these rings were created by meteoroid impacts on small nearby moons. As a small meteoroid strikes tiny Adrastea, for example, it will bore into the moon, vaporize, and explode dirt and dust off into a Jovian orbit. Pictured above is an eclipse of the Sun by Jupiter, as viewed from Galileo. Small dust particles high in Jupiter's atmosphere, as well as the dust particles that compose the rings, can be seen by reflected sunlight.