Astronaut Don Pettit shows how to take long-exposure photos from the ISS
Briefly

Pettit describes how he brought a homemade star tracker with him to space, allowing his camera to capture long-exposure photos without the stars leaving any trails behind.
Without this tracker, you can not take photo[s] longer than 1/2 sec without star blur due to the rate of orbital motion,
Read at The Verge
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