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. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Science Source / QA International |
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