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¡¦Image Credit: ESA/ID&Sense/ONiRiXEL¡¦SpaceNews - How America Can Become a Leader in Cleaning Up Space¡¦NASA(1) - NATIONAL SPACE POLICY of the UNITED STATES of AMERICA (issued in June, 2010)¡¦NASA(2) - NATIONAL SPACE POLICY of the UNITED STATES of AMERICA (issued in December, 2020)¡¦Secure World Foundation - The Evolution of U.S. National Policy for Addressing the Threat of Space Debris¡¦ESA - Space debris by the numbers¡¦National Science and Technology Council - NATIONAL ORBITAL DEBRIS RESEARCH AND DEVELOPMENT PLAN

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