The title of this crossword is taken from a quote by Sally Ride, the first American woman in space. In this crossword, we go back to the time when we first realized the Earth went around the Sun and not vice versa, and we look toward future explorations, such as the hunt to find dark matter. There’s no question that the Universe around us will always fascinate the human race.

Over thousands of years, a few men and women have had groundbreaking ideas that changed the course of history. Many others have contributed to modernizing civilization. This crossword features some of them.