信使号在水星上的最后一天
(原标题: MESSENGER's Last Day on Mercury)
2025-05-01
浏览次数: 49
2015年4月30日，第一个进入水星内行星轨道的信使号宇宙飞船停在了水星表面的这一区域。由信使号图像和激光高度计数据构建而成的投影场景，向北望去是广阔的、充满熔岩的莎士比亚盆地的东北边缘。大的，48公里（30英里）宽的陨石坑Janacek靠近左上角边缘。地形高度用颜色编码，红色区域比蓝色区域高出约3公里。信使号的最终轨道预计将在中心附近结束，航天器以每秒近4公里（超过8700英里/小时）的速度撞击月球表面，并形成一个直径约16米（52英尺）的新陨石坑。对水星背面的撞击没有被望远镜观测到，但在没有从航天器探测到信号的情况下证实了这一点，因为航天器有时间从水星后面出现。水星表面、空间环境、地球化学和测距探测器于2004年发射，在2011年到达太阳系最里面的行星后，完成了4000多次轨道飞行。
查看原文解释
The first to orbit inner planet Mercury, the MESSENGER spacecraft came to rest on this region of Mercury's surface on April 30, 2015. Constructed from MESSENGER image and laser altimeter data, the projected scene looks north over the northeastern rim of the broad, lava filled Shakespeare basin. The large, 48 kilometer (30 mile) wide crater Janacek is near the upper left edge. Terrain height is color coded with red regions about 3 kilometers above blue ones. MESSENGER'S final orbit was predicted to end near the center, with the spacecraft impacting the surface at nearly 4 kilometers per second (over 8,700 miles per hour) and creating a new crater about 16 meters (52 feet) in diameter. The impact on the far side of Mercury was not observed by telescopes, but confirmed when no signal was detected from the spacecraft given time to emerge from behind the planet. Launched in 2004, the MErcury Surface, Space ENvironment, GEochemisty and Ranging spacecraft completed over 4,000 orbits after reaching the Solar System's innermost planet in 2011.