Time-lapse photography is where you take a photograph of the same scene at a set interval (say, every 5 seconds), and then the resulting photographs are turned into a video. This lets you speed up the movement of something, so what might have been unseen as it happens so slowly becomes very noticeable.

This can give very nice results for moving radio telescopes! Some time-lapses I’ve taken are available here:

These time-lapses are available under the Creative Commons Attribution Share-Alike 4.0 licence.