Astronomers first learned about free-floating planets in the 1990s, but many unanswered questions remain, such as the conditions under which they form, their size and composition, and their relative abundance in the galaxy. This effectively doubles the total number of known free-floating planets—a sign that the total population of rogue planets in our galaxy is huge. The newly detected rogue planets were detected in nearly 20 years’ worth of astronomical data, including observations gathered by the European Southern Observatory, the Canada-France-Hawaii Telescope, the Subaru Telescope, and ESA’s Gaia satellite.