Final answer:
Shapley used the distribution of globular clusters in our galaxy to determine that the Sun was not at the center of the Milky Way.
Step-by-step explanation:
True. Shapley used the distribution of globular clusters in our galaxy to determine that the Sun was not at the center of the Milky Way. Globular clusters are collections of thousands to millions of stars that are tightly bound by their own gravity and are found in a spherical distribution around the galactic center. By mapping the positions of 93 globular clusters in space, Shapley found that their center was not at the Sun but at a distant point along the Milky Way in the direction of Sagittarius, indicating that the Sun is not at the center of the galaxy. This discovery revolutionized our understanding of the position and structure of the Milky Way galaxy.