NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
International Space Station (ISS) component. Close-up of part of one of the pressurised mating adapters (PMA-3) from the ISS. PMAs are used to connects ISS modules and spacecraft. The ISS is the largest artificial body in orbit and can often be seen by the naked eye. Inhabited by a team of astronauts it serves as a space research laboratory.
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