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Loading contentThe Association of Lunar and Planetary Observers, which coordinates amateur observation of the Moon, the planets, comets, and asteroids — organising observing programmes and archiving the results so that amateur monitoring of the Solar System adds up to something lasting.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.