Spacewalks take place at daytime, and even at night they use powerful spotlights that make it as bright as day. You may be fooled because there is no blue sky above them but except for that the conditions are the same as a bright summer day here on the ground. So in order to be able to capture anything on camera they have to adjust them to daytime conditions. And with these settings the dim light from the stars is no longer visible. It is even hard to see the Moon with those settings, just like the Moon is very hard to see on daytime images taken on the ground.
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