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Space telescopes at light speed

Written by  Jeff Foust Wednesday, 04 February 2026 14:00
The Nancy Grace Roman Space Telescope completed final assembly in late November 2025. Credit: Jolearra Tshiteya/NASA

Light is the fastest phenomenon in the universe, clocking in at just under 300,000 kilometers per second. The telescopes that observe that light, from radio waves to gamma rays, are built at rather slower speeds. Take, as one example, the James Webb Space Telescope. NASA began feasibility studies for the mission in the mid-1990s and […]

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