You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: SCIENTISTS 
Clue: In 1543 he wrote, "Finally we shall place the sun himself at the center of the universe"
nicolaus copernicus

Category: COLLEGES & UNIVERSITIES 
Clue: This New York univ. is named for the family whose company was the first to sell toothpaste in a tube
colgate university

Category: GREEK MYTHOLOGICAL GROUPS 
Clue: 2 groups, 1 of 9 & 1 of 3, that include a member named Thalia

the muses and the graces