新月恩克拉多斯
(原标题: Crescent Enceladus)
2023-12-16
浏览次数: 36
从阴影中窥视，卡西尼号飞船拍摄的诱人的内卫星土卫二面向土星的半球。2016年11月，卡西尼号的相机在距离月亮明亮的月牙约13万公里的地方，朝近太阳的方向拍摄了这一戏剧性的场景。事实上，遥远的世界反射了90%以上的阳光，使其表面的反射率与新雪大致相同。土卫二直径只有500公里，是一颗异常活跃的卫星。卡西尼号在飞越期间收集的数据和图像显示，南极间歇泉喷出了水蒸气和冰粒，有证据表明，在这颗卫星的冰壳下隐藏着液态水的海洋。
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Peering from the shadows, the Saturn-facing hemisphere of tantalizing inner moon Enceladus poses in this Cassini spacecraft image. North is up in the dramatic scene captured during November 2016 as Cassini's camera was pointed in a nearly sunward direction about 130,000 kilometers from the moon's bright crescent. In fact, the distant world reflects over 90 percent of the sunlight it receives, giving its surface about the same reflectivity as fresh snow. A mere 500 kilometers in diameter, Enceladus is a surprisingly active moon. Data and images collected during Cassini's flybys have revealed water vapor and ice grains spewing from south polar geysers and evidence of an ocean of liquid water hidden beneath the moon's icy crust.