What I participated in as an undergraduate at Swarthmore College:

owl on a ruler

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* I photographed stars on glass plates {really!!!} for determination of their positions. By measuring their positions over a number of years astronomers could tell if they were orbiting with another star that's too faint too see, or possible if they're orbiting with a big planet. Dr. Wulff Heintz of Sproul Observatory found the smallest brown dwarf ever found this way. {A brown dwarf is like a star that never made it into a full fledged star, it's like a campfire that never really got going.}