In 2021, a rocket is scheduled to lift off from French Guiana carrying the largest space telescope ever made. Known as the James Webb Space Telescope, astronomers will use this beast of an observatory to study everything from habitable exoplanets to the formation of the first galaxies. JWST is the first mega-telescope of its kind to ever launch into space—and it may also be the last. The next behemoth might instead get assembled in space with the help of robots.

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