Here are 15 NASA missions whose legacy continues to shape science and exploration today. Project Gemini (1961-1966) Before astronauts could reach the Moon, NASA had to master orbital rendezvous, docking, long-duration spaceflight, and spacewalks. James Webb Space Telescope (2021-Present) Built to succeed Hubble, the James Webb Space Telescope has observed some of the earliest known galaxies, analyzed exoplanet atmospheres, and provided unprecedented infrared views of the cosmos. With programs such as Artemis, Europa Clipper, and future Mars missions on the horizon, the next history-making NASA mission may already be on its way. Check out 7 upcoming NASA missions here.