Hydrogen halo

Image caption: The first ultraviolet (UV) image of the geocorona – Earth’s outer atmosphere. The image was taken from the Moon in 1972 during the Apollo 16 mission, using a telescope designed and built by Dr. George Carruthers. Credit: G. Carruthers (NRL) et al. / Far UV Camera / NASA / Apollo 16

NASA's Carothers mission will photograph Earth's atmospheric "halo"

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From L1, two ultraviolet cameras will record the geocorona (exosphere) and help predict space weather and understand the process of hydrogen escaping from planets.
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