Thumb with sand grain held below the full moon.
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During 1999, the HST's Wide Field Planetary Camera actually took a series of overlapping
exposures of the Moon's surface while the telescope's spectroscopic camera was being calibrated.
The WFPC's field of view (fov) is 2.7 minutes wide, about one twelfth the
diameter of the moon. To photograph the full face of the Moon would require
one hundred and thirty (130) WFPC exposures.
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