The Cassini spacecraft snapped this shot in February as it swooped past Calypso, which trails behind the larger moon Tethys in roughly the same orbit around Saturn.

这张照片是在今年2月份，卡西尼号宇宙飞船从卡里索普上方快速飞过时拍摄到的。 卡里索普星的轨道在土星第二大卫星特提斯的后方，二者围绕土星旋转的轨道大致相同。

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It covers the moon's leading hemisphere - the side that faces forward as it moves in its orbit - which suggests that the black material has been swept up from space as the moon moves around Saturn.

土卫八较暗的一面实在是非常的黑暗，它覆盖着土卫八正对公转的半球被认为在绕土星公转时被宇宙空间扫除了一些黑色的物质，所以它只是表面的一层不足一米的薄层。

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It was launched in 1978, and has thus spent almost two-thirds of the entire space age, which began in 1957 with the launch of Sputnik, in orbit around the sun.

它于1978年发射，所以它已经工作了近三分之二个太空时代—太空时代开始于1957年发射的，围绕太阳运行的第一颗人造卫星。

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Once the bullet is free of the atmosphere, which happens a few hundred kilometers up, it follows an elliptical orbit around Earth.

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