2005年5月19日にスピリットがグセフ・クレーターで撮影した火星の日没（青い夕焼け）On May 19th, 2005, NASA’s Mars Exploration Rove
2005年5月19日にスピリットがグセフ・クレーターで撮影した火星の日没（青い夕焼け）On May 19th, 2005, NASA’s Mars Exploration Rover Spirit captured this stunning view as the Sun sank below the rim of Gusev crater on Mars…Other images have shown that the twilight glow remains visible, but increasingly fainter, for up to two hours before sunrise or after sunset. The long martian twilight (compared to Earth’s) is caused by sunlight scattered around to the night side of the planet by abundant high altitude dust. Similar long twilights or extra-colorful sunrises and sunsets sometimes occur on Earth when tiny dust grains that are erupted from powerful volcanoes scatter light high in the atmosphere. Image credit: NASA/JPL/Texas A&M/Cornell -- source link
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