保护地球，探索宇宙，发现文明
2020 May 30 Green Flashes: Sun, Moon, Venus, Mercury Image Credit & Copyright: Marcella Giulia Pace Explanation: Follow a sunset on a clear day against a distant horizon and you might glimpse green just as the Sun disappears from view. The green flash is caused by refraction of light rays traveling to the eye over a long path through the atmosphere. Sho...
2020 May 29 Mercury Meets Crescent Venus Image Credit & Copyright: Marco Meniero Explanation: That’s not a bright star and crescent Moon caught between branches of a eucalyptus tree. It’s Venus in a crescent phase and Mercury. Near the western horizon after sunset, the two inner planets closely shared this telescopic field of view on May 22,...
2019 December 2 Mercury Crosses a Quiet Sun Video Credit: NASA, SDO, NASA’s Science Visualization Studio; Music: Gustav Sting (Kevin MacLeod) via YouTube Explanation: What’s that black dot crossing the Sun? The planet Mercury. Mercury usually passes over or under the Sun, as seen from Earth, but last month the Solar System’s innermost plane...
2019 November 14 Mercury and the Quiet Sun Image Credit & Copyright: John Chumack Explanation: On November 11, 2019 the Sun was mostly quiet, experiencing a minimum in its 11 year cycle of activity. In fact, the only spot visible was actually planet Mercury, making a leisurely 5 1/2 hour transit in front of the calm solar disk. About 1/200th the apparent...
The planet Mercury is seen in silhouette, low center, as it transits across the face of the Sun, Monday, Nov. 11, 2019, from Washington, D.C. Mercury’s last transit was in 2016. The next won’t happen again until 2032. Image Credit: NASA/Bill Ingalls 2011年11月11日，星期一，在华盛顿特区，水星在穿过太阳表面的过程中出现了一个低中心的剪影。水星最后一次凌日是在2016年。下一次直到2032年才会发生。 图片来源:NASA/Bill Ingalls
2019 November 13 Mercury in Silhouette Image Credit & Copyright: Martin Wise Explanation: The small, dark, round spot in this solar close up is planet Mercury. In the high resolution telescopic image, a colorized stack of 61 sharp video frames, a turbulent array of photospheric convection cells tile the bright solar surface. Mercury’s more regular ...
2019 November 10 A Mercury Transit Sequence Image Credit & Copyright: Dominique Dierick Explanation: Tomorrow — Monday — Mercury will cross the face of the Sun, as seen from Earth. Called a transit, the last time this happened was in 2016. Because the plane of Mercury’s orbit is not exactly coincident with the plane of Earth’s or...
2019 October 21 A Mercury Transit Music Video from SDO Video Credit: NASA’s Goddard Space Flight Center, Genna Duberstein; Music: Encompass by Mark Petrie Explanation: What’s that small black dot moving across the Sun? Mercury. Possibly the clearest view of Mercury crossing in front of the Sun in 2016 May was from Earth orbit. The Solar Dynamics ...
根据美国国家航空航天局（NASA）的月球勘测轨道器（Lunar Reconnaissance Orbiter，LRO）和信使号（MErcury Surface, Space ENvironment, GEochemistry and Ranging spacecraft，MESSENGER）水星探测器的最新数据分析，地球的卫星月球以及离太阳最近的行星水星的水冰含量可能远远超出先前预期。 在这两个星球两极附近的陨石坑中都发现了潜在的冰沉积物。来自加州大学洛杉矶分校（UCLA）的第一作者Lior Rubanenko表示，在月球上：“我们发现浅陨石坑往往位于月球南极附近此前曾被检测到表面冰层的区域，因此推断陨石坑之所以浅，最有可能由于埋藏于其下的厚冰沉积物的存在导致的。” 月球南极附近永久阴影区的浅冰状陨石坑的概念图...