SpaceX's Crew Dragon capsule carrying four civilians safely splashed down in the Atlantic Ocean on September 18, 2021 (Credit: inspiration4.com)

Hawthorne, California-based SpaceX is known for making history. It was the first private spaceflight company to transport astronauts to the International Space Station and the first to develop a reusable rocket booster. On September 18, 2021, the American aerospace company did it again by completing the world's first-ever all-civilian mission to space.