NASA has reported that there is no such thing as two moons showing in the skies over the world.
美国航天局报告说，从来没有世界各地天空中同时出现两个月亮这样的事情。
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Over decades of study, Cassini went on to discover four of Saturn's moons along with the so-called Cassini Division between Saturn's brightest rings.
在几十年的研究中，卡西尼陆续在土星最明亮星环之间的所谓“卡西尼环缝”一带发现了土星的4颗卫星。
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No one has yet discovered any extrasolar moons, but some researchers think the capacity to detect them-and even analyze them for habitability-may be just over the horizon.