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Planets and moons

Planets A-Z

Adams, John Couch    (1819–1892) British astronomer who predicted the existence and position of Neptune. Without knowing it, Adams made his predictions at almost exactly the same time as Le Verrier, who is today credited with Neptune's discovery.

Albedo   A measure of how strongly an object reflects light. A completely dark, non-reflective object has an albedo of 0, while an object that reflects all light that hits it has an albedo of 1. The Earth has an albedo of 0.36 and Venus has an albedo of 0.65.

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