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Loading contentGalileo's 'Starry Messenger', the first published account of telescopic astronomy: the four moons of Jupiter, the mountains of the Moon, and the countless stars of the Milky Way.
Facts on this topic will be cited from these primary and reference sources.
General reference for the history of astronomy, biographies, and cultural context.
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.