![SOFIA 747SP](https://www.nasa.gov/wp-content/uploads/2023/03/471436main_ED10-0182-02_full_full.jpg)
SOFIA 747SP
In stark contrast with the deep blue sky at high altitude, NASA's Stratospheric Observatory for Infrared Astronomy 747SP checks out operation of its telescope cavity doors.
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https://www.nasa.gov/image-detail/sofia-747sp-15/
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