SP-424 The Voyage of Mariner 10

Fig. 5-6. Mariner's cameras also checked their sharp focus on stars to show that they had not degraded from the heater failure. A stellar field is reproduced in (a) [left]; (b) identifies the stars photographed.

Fig. 5-6. Mariner's cameras also checked their sharp focus on stars to show that they had not degraded from the heater failure. A stellar field is reproduced in (a) [left]; (b) identifies the stars photographed.

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