NASAのインスタグラム(nasa) - 9月20日 10時18分

Clear Skies Over the United States : On Sept. 17, 2015, astronaut Scott Kelly captured images and video from the International Space Station during an early morning flyover of the United States. Sharing with his social media followers, Kelly wrote, "Clear skies over much of the USA today. #GoodMorning from @国際宇宙ステーション! #YearInSpace." Tuesday, Sept. 15 marked the midpoint of the one-year mission to the space station for Kelly and Russian cosmonaut Mikhail Kornienko. The average International Space Station expedition lasts four to six months. Research enabled by the one-year mission will help scientists better understand how the human body reacts and adapts to long-duration spaceflight. This knowledge is critical as NASA looks toward human missions deeper into the solar system, including to and from Mars, which could last 500 days or longer.

Image Credit: NASA

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