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NASA - Ring-a-ding-ding!🪐土星的这张照片是由卡西尼号航天器捕获的，当时它绕轨道约700,000英里 (1.1
案例简介：叮叮响!🪐土星的这张照片是卡西尼号飞船在距2007年行星约700,000英里 (110万公里) 的轨道上拍摄的。阴影长度的变化标志着土星季节的过去。当行星缓慢接近2009年发生的春分时，环形阴影进一步向南滑动。土星的春分大约每15个地球年发生一次，下一个春分有望2025年5月6日。当土星接近其春分点时，春分点是行星轨道上太阳直接在赤道上方照射的点，其环主要被反射出行星表面的阳光照亮。因此，由行星照耀的环的截面比由直射阳光照射的环的截面亮得多。图片描述: 土星及其环。土星及其环的奶油褐色在太空的黑暗中脱颖而出。除了覆盖在黑暗中的孤独部分外，大多数行星的环都被照亮，从而从环中产生了一个字母 “c” 的形状。在土星的最北端的地区，明亮的云朵在该地区的蓝灰色天空中嬉戏。在这张图片中可以看到土星的三个卫星: 位于2点位置的Mimas，位于4点位置的Janus和位于8点位置的Pandora。信用: 美国宇航局/JPL-加州理工学院/太空科学研究所 # 美国宇航局 # 太空 # 太阳能系统 # 土星 # 卡西尼 # 环 # 轨道 # 春分
NASA - Ring-a-ding-ding!🪐土星的这张照片是由卡西尼号航天器捕获的，当时它绕轨道约700,000英里 (1.1
案例简介：Ring-a-ding-ding! 🪐This image of Saturn was captured by the Cassini spacecraft while it orbited about 700,000 miles (1.1 million kilometers) from the planet in 2007. The changing length of the shadow marks the passing of the seasons on Saturn. As the planet slowly neared its equinox which occurred in 2009, the ring-casted shadows slid further south. Saturn's equinoxes occur approximately every 15 Earth years, with the next one expected on May 6, 2025. As Saturn approaches its equinox, the point in a planet's orbit where the Sun shines directly overhead at the equator, its rings become mainly illuminated by the sunlight which reflects off the planet’s surface. Hence, the section of the rings illuminated by planetshine are much brighter than the section of the rings illuminated by direct sunlight. Image description: Saturn and its rings. The creamy browns of Saturn and its rings stand out against the darkness of space. Most of the planet’s rings are illuminated except a lone section that is covered in darkness, creating a shape like a letter “c” out of the rings. In the northernmost areas of Saturn wispy bright clouds play in the blue-gray skies of the region. Three of Saturn's moons are visible in this image: Mimas at the 2 o'clock position, Janus at the 4 o'clock position and Pandora at the 8 o'clock position. Credit: Credit: NASA/JPL-Caltech/Space Science Institute#NASA #Space #SolarSystem #Saturn #Cassini #Rings #Orbit #Equinox
NASA - Ring-a-ding-ding! 🪐This image of Saturn was captured by the Cassini spacecraft while it orbited about 700,000 miles (1.1
案例简介：叮叮响!🪐土星的这张照片是卡西尼号飞船在距2007年行星约700,000英里 (110万公里) 的轨道上拍摄的。阴影长度的变化标志着土星季节的过去。当行星缓慢接近2009年发生的春分时，环形阴影进一步向南滑动。土星的春分大约每15个地球年发生一次，下一个春分有望2025年5月6日。当土星接近其春分点时，春分点是行星轨道上太阳直接在赤道上方照射的点，其环主要被反射出行星表面的阳光照亮。因此，由行星照耀的环的截面比由直射阳光照射的环的截面亮得多。图片描述: 土星及其环。土星及其环的奶油褐色在太空的黑暗中脱颖而出。除了覆盖在黑暗中的孤独部分外，大多数行星的环都被照亮，从而从环中产生了一个字母 “c” 的形状。在土星的最北端的地区，明亮的云朵在该地区的蓝灰色天空中嬉戏。在这张图片中可以看到土星的三个卫星: 位于2点位置的Mimas，位于4点位置的Janus和位于8点位置的Pandora。信用: 美国宇航局/JPL-加州理工学院/太空科学研究所 # 美国宇航局 # 太空 # 太阳能系统 # 土星 # 卡西尼 # 环 # 轨道 # 春分
NASA - Ring-a-ding-ding! 🪐This image of Saturn was captured by the Cassini spacecraft while it orbited about 700,000 miles (1.1
案例简介：Ring-a-ding-ding! 🪐This image of Saturn was captured by the Cassini spacecraft while it orbited about 700,000 miles (1.1 million kilometers) from the planet in 2007. The changing length of the shadow marks the passing of the seasons on Saturn. As the planet slowly neared its equinox which occurred in 2009, the ring-casted shadows slid further south. Saturn's equinoxes occur approximately every 15 Earth years, with the next one expected on May 6, 2025. As Saturn approaches its equinox, the point in a planet's orbit where the Sun shines directly overhead at the equator, its rings become mainly illuminated by the sunlight which reflects off the planet’s surface. Hence, the section of the rings illuminated by planetshine are much brighter than the section of the rings illuminated by direct sunlight. Image description: Saturn and its rings. The creamy browns of Saturn and its rings stand out against the darkness of space. Most of the planet’s rings are illuminated except a lone section that is covered in darkness, creating a shape like a letter “c” out of the rings. In the northernmost areas of Saturn wispy bright clouds play in the blue-gray skies of the region. Three of Saturn's moons are visible in this image: Mimas at the 2 o'clock position, Janus at the 4 o'clock position and Pandora at the 8 o'clock position. Credit: Credit: NASA/JPL-Caltech/Space Science Institute#NASA #Space #SolarSystem #Saturn #Cassini #Rings #Orbit #Equinox
NASA - Ring-a-ding-ding!🪐土星的这张照片是由卡西尼号航天器捕获的，当时它绕轨道约700,000英里 (1.1
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NASA - Ring-a-ding-ding! 🪐This image of Saturn was captured by the Cassini spacecraft while it orbited about 700,000 miles (1.1
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