SP-424 The Voyage of Mariner 10
Fig. 1-8. Mercury, too, reveals few details, not because of clouds but because of the planet's small size, its distance from the Earth, and its closeness to the Sun.

Fig. 1-8. Mercury, too, reveals few details, not because of clouds but because of the planet's small size, its distance from the Earth, and its closeness to the Sun. Photographs (a) show only indistinct shadings, and maps (b) made on the basis of observations from Earth are virtually useless.


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