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NASA's Troubled $8-Billion Hubble Successor Is Back on Track

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First 6 mirrors for JWST

The first six of 18 James Webb Space Telescope primary mirror segments are shown being prepped for testing in Goddard's cryogenic chamber.

Credit: NASA/MSFC/David Higginbotham

The Hubble Space Telescope is still operating, but its successor is already waiting in the wings.

From Scientific American
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