When she was 14, Mary Williams already knew she wanted to be an astronomer. Now, at 34, she's a researcher at the Leibniz Institute for Astrophysics in Potsdam. She's trying to find out how galaxies develop.
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This is an important question for cosmologists. She was looking for answers in our own galaxy, the Milky Way when she made a sensational discovery. She detected the remains of a dwarf galaxy that was evidently swallowed up by the Milky Way.