Searching for Missing Mass

In 1933, astronomer Fritz Zwicky discovered that there was something deeply wrong with our view of the universe. While calculating the amount of mass in the Coma galaxy cluster, he noticed that there appeared to be a hundred times more mass than what could be visually seen. The discrepancy was so large that Zwicky believed a new form of non-visible matter was the reason for it. He proposed a new name for the mysterious mass as well: dark matter.