Star trackers are generally designed to orbit alongside the Earth, or in Pettit’s case, the ISS, avoiding distortion of images in the night sky. One of the photos taken by Pettit was taken in 15 seconds. He explained that the tracking device makes a complete revolution in 90 minutes, synchronizing with the movement of the station. Without this device, it would not be possible to take a photo lasting longer than half a second without blurring the stars due to the speed of orbital motion.
However, Pettit noted that establishing an audience on a mobile platform is no easy task. It can now expose the stars for up to 30 seconds without any significant movement. Another challenge is shooting through ISS windows, which can distort the image due to the thickness of the glass and the viewing angle.
Source: Ferra
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