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NASA’s James Webb Space Telescope turns on cameras to look at first star target

Spacecraft controllers have begun powering up the four cutting-edge instruments on NASA’s James Webb Space Telescope as they prepare for the observatory’s first glimpses of a target star.

That star, called HD 84406, is located 241 light-years from Earth and part of the constellation Ursa Major, the Great Bear. The images will not be used for science, but will help the ground teams align the 18 golden segments of Webb’s 21-foot-wide (6.5 meters) main mirror

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