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NASA delays launch of James Webb telescope to 2021

Engineers work on the James Webb Space Telescope at Goddard Space Flight Center in 2016.
Engineers and technicians assemble the James Webb Space Telescope November 2, 2016 at NASA's Goddard Space Flight Center in Greenbelt, Maryland. Photo: Alex Wong/Getty Images.

NASA announced Wednesday it's once again delaying the launch date for the James Webb Space Telescope, this time to March 30, 2021.

Why this matters: The JWST will be NASA's most powerful space-based telescope yet, and is intended to be Hubble's successor. The program has been beset by technical problems, delays and cost overruns. The latest delay moves the launch back from 2020 to 2021.