The Dutch astronomer Jan Hendrik Oort (1900-1992) overturned the idea that our sun is at the center of the Milky Way galaxy. He contributed greatly to knowledge about the structure and evolution of our galaxy, and also discovered the place of origin of most comets, the Oort Cloud.
Captain William Kidd (c. 1645-1701) was one of the most notorious pirates in history. He sailed the coast of North America, the Caribbean, and the Indian Ocean, plundering ships. To this day, rumors persist that he left behind a great treasure.