2026年2月7日
Crescent Enceladus
Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA
Explanation: 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.
Tomorrow’s picture: Sun spotted
新月形的土卫二
影像提供: Cassini Imaging Team, SSI, JPL, ESA, NASA
说明: 在这张卡西尼号探测器拍摄的照片中，引人入胜的内侧卫星土卫二之面向土星的半球从阴影中探出头来，令人着迷。这幅壮丽的景象拍摄于2016年11月，当时卡西尼号的相机几乎朝向太阳，距离土卫二明亮的月牙形约13万公里。照片中，北方朝上。事实上，这个遥远的天体反射了超过90%接收到的阳光，使其表面的反射率与新雪几乎相同。直径仅500公里的土卫二是一颗令人惊讶的活跃卫星。卡西尼号飞掠土卫二期间收集的数据和影像显示，其南极间歇泉喷发出水蒸气和冰粒，并且在土卫二冰壳下隐藏着液态水海洋的证据也已显现。
明日的图片: pixels in space
