NASA的毅力号火星车于2026年7月2日用Mastcam-Z仪器拍摄到一幅罕见的景象：地球在火星天空中被火卫一完全遮挡1。这是人类首次从另一行星表面记录到地球在其他物体后面消失的情景1。当时毅力号位于火星杰泽罗陨石坑边缘，在火星当地太阳时间晚上7点左右进行了这次观测1。
在拍摄的图像中，地球距离火星车约1.95亿英里，仅显示为单个像素大小的光点1。火卫一宽度约为17英里，在火星天空中的视大小约为从地球看月球宽度的三分之一，足以完全遮挡远处的地球1。火卫一距火星表面约4,850英里，每天穿过火星天空三次1。根据观测结果，地球从火星上连续可见的时间可达数个月1。
NASA's Perseverance rover recorded a historic moment on July 2, 2026, when it photographed Earth vanishing behind Phobos, Mars's moon, using its Mastcam-Z instrument.1 This marks the first time humanity has documented Earth disappearing behind another celestial body as seen from the surface of another planet.1
At the time of observation, Earth appeared as a single pixel-sized point of light in the Martian sky, located approximately 195 million miles from the rover.1 Phobos, orbiting Mars at a distance of 4,850 miles from the planet's surface, completely eclipsed Earth as it passed in front of it.1 The observation occurred around 7 p.m. local solar time at the rover's location on the rim of Jezero Crater, on Mars sol 1907.1
The geometry of this rare alignment showcases the vast distances involved in interplanetary observation. Phobos, with a width of approximately 17 miles, appears only about one-third the angular size of Earth's Moon as viewed from Earth.1 Despite its small apparent size, Phobos was large enough to fully obscure the distant point of light representing Earth.1 Earth remained continuously visible in the Martian sky for several months, and Phobos crosses the Martian sky three times daily, creating multiple opportunities for such alignments.1
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