Discovered in 1930 by Clyde Tombaugh, Pluto is the only planet that has not been visited by a space probe. It is a strange planet, different from the other eight. Because it is about the same size as the Moon, some scientists think of it as an asteroid or a comet.

Discovered in 1930 by Clyde Tombaugh, Pluto is the only planet that has not been visited by a space probe. It is a strange planet, different from the other eight. Because it is about the same size as the Moon, some scientists think of it as an asteroid or a comet.

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2475 x 2478 px | 17.5 MB

21.0 x 21.0 cm | 8.2 x 8.3 in (300 dpi)