2019 October 18 Interstellar Interloper 2I/Borisov Image Credit: NASA, ESA, and D. Jewitt (UCLA) et al. Explanation: After the 2017 detecton of 1I/’Oumuamua, comet 2I/Borisov has become the second recognized interstellar interloper. Like ‘Oumuamua, Borisov’s measured hyperbolic tra […]
2019 October 17 Moons of Saturn Image Credit: Cassini Imaging Team, SSI, JPL, NASA Explanation: On July 29, 2011 the Cassini spacecraft’s narrow-angle camera took this snapshot and captured 5 of Saturn’s moons, from just above the ringplane. Left to right are small moons Janus and Pandor
木星让位，土星成为新的卫星之王。 卡耐基科学研究所（Carnegie Institution for Science）的斯科特•S•谢泼德（Scott S. Sheppard）领导的研究小组发现了环绕土星的20颗新卫星。这使得这颗带有光环的行星的卫星总数达到了82颗，超过了木星的79颗。国际天文协会小行星中心（International Astronomical Union’s Minor Planet Centre）于2019年10月7日宣布了这一发现。 新发现的每颗卫星直径均约5公里（3英里）。其中有17颗卫星的运行轨道是反向的，即逆行卫星，这意味着它们的运行方向与土星自转方向相反。剩余三
Like a drop of dew hanging on a leaf, Tethys appears to be stuck to Saturn’s A and F rings from this perspective in this 2014 image from the Cassini mission. For more than a decade, Cassini shared the wonders of Saturn and its family of icy moons—taking us to astounding worlds where methane ri
2019 September 20 Saturn at Night Image Credit: NASA, JPL-Caltech, Space Science Institute, Mindaugas Macijauskas Explanation: Still bright in planet Earth’s night skies, good telescopic views of Saturn and its beautiful rings often make it a star at star parties. But this stunning view of Sat
2019 September 15 A Long Storm System on Saturn Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA Explanation: It was one of the largest and longest lived storms ever recorded in our Solar System. First seen in late 2010, the above cloud formation in the northern hemisphere of Saturn started l
2019 August 3 Mimas in Saturnlight Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA Explanation: Peering from the shadows, the Saturn-facing hemisphere of Mimas lies in near darkness alongside a dramatic sunlit crescent. The mosaic was captured near the Cassini spacecraft’s final close
2019 July 7 Crescent Saturn Image Credit: NASA, ESA, SSI, Cassini Imaging Team Explanation: Saturn never shows a crescent phase — from Earth. But when viewed from beyond, the majestic giant planet can show an unfamiliar diminutive sliver. This image of crescent Saturn in natural color was take
一幅伪彩色图像拼接图显示了嵌于土星环缝隙中的土星卫星之一：土卫三十五（Daphnis），以及它在基勒环缝（Keeler gap）边缘激起的波浪。2017年卡西尼号（Cassini）近轨道所收集到的图像为我们提供了了解土星环复杂运行机制的新视角。 版权：美国国家航空航天局（NASA）/喷气推进实验室 -加利福尼亚理工学院（JPL-Caltech）/太空科学研究所（Space Science Institute） 最新分析显示，NASA的卡西尼号在执行任务最后一年期间接近土星时，提供了关于结构复杂的土星环错综复杂的运行机制的一些细节。 尽管卡西尼号土星探测任务已于2017年结束，但从其收集的数据中
