Star field image of the Southern Cross from Space_Station during Expedition 6 in 2003 showing the atmosphere on edge illuminated by green airglow from atomic oxygen.
At this time Space Station’s orbital attitude was a solar inertial attitude (XPOP) that allowed the solar panels to point towards the sun without any tracking (solar tracking was not added to ISS until much later). Essentially, the station itself was the tracking mechanism thus for a camera mounted to Space Station, a time exposure yielded stars as pinpoints.
Since about 2006, ISS has flown an Earth pointing attitude where one side remains pointed nadir towards Earth (LVLH) and time exposures yield stars that are arcing trails. This attitude limits sharp star images to less than a half second.