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The Nancy Grace Roman Space Telescope’s primary mirror has been completed, NASA announced. The telescope will have a field of view 100× greater than the Hubble Space Telescope, and it will use infrared light to study hidden structures.
The mirror is 2.4 m across, the same size as the Hubble Space Telescope’s main mirror, though it is less than one-fourth of the weight. The mirror is 186 kg, owing that reduction to improved technology. In concert with other optics, the mirror will transmit light to Roman’s two scientific instruments, the Wide Field Instrument and the Coronagraph Instrument.
The Roman Space Telescope’s primary mirror reflects an American flag. Its surface is figured to a level hundreds…