Pluto
Pluto is the only planet in the solar system still unvisited by a spacecraft. Its status as the only planet in our Sun's family still studied purely by telescope is unique—and frus...
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ASTRONOMY AND SPACE EXPLORATION
Is Pluto a Planet?
Viewpoint: Yes, Pluto's status as a planet has been continually defended by the International Astronomical Union. Although its size and ellipt...
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Pluto
Neptune was discovered on September 23, 1846, as the result of lengthy mathematical work by John Couch Adams and Jean Urbain Le Verrier (1811-1877). Only one week later talk surfaced of yet a mo...
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Pluto
Is Pluto a Planet
Pluto