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Loading contentObserving the sky directly with the eye, whether unaided or through binoculars or a telescope. Visual astronomy trains the observer to see faint detail through averted vision and dark adaptation, and remains the most immediate way to experience the Moon, planets, and brighter deep-sky objects — the foundation on which every imaging technique is built.
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.