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Watch live: NASA has launched the most powerful space telescope ever

The James Webb Space Telescope blasted off from French Guinea around 7:20 a.m. ET on Saturday. The NASA launch is decades in the making and should reveal the earliest galaxies in the universe.
NASA's James Webb Space Telescope is secured on top of the Ariane 5 rocket that will launch it to space from Europe's Spaceport in French Guiana on Dec. 11.
Updated December 25, 2021 at 7:26 AM ET

The most powerful space telescope ever built has officially left Earth. NASA's James Webb Space Telescope blasted off on December 25 at 7:20 a.m. Eastern from a European spaceport in French Guiana.

The roughly $10 billion observatory, which is bigger and more sophisticated than the iconic Hubble Space Telescope, has been in the works since the late 1980s. What it finds could revolutionize our understanding of the universe and our place in it.

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