Sometimes sunlight bounces off the ground into the crater, and then ricochets upward to Danuri as it passes overhead. Other images are illuminated by earthlight sunlight that has bounced off the Earth toward the moon. That is enough to brighten the shadowed craters a little.
The new instrument, ShadowCam, takes superlong exposures, increasing sensitivity by a factor of about 200, making the invisible darkness visible, allowing for images of features like boulder movement within Shackleton Crater.
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