NASA NTRS · 20170010230
The James Webb Space Telescope Mission
Abstract
The universe is 13.7 billion years old. Hubble can look back in time to observe an epoch during which the universe was approximately 1 billion years old, and has seen some galaxies at even earlier epochs.
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Greenhouse, Matt. 2017-10-07. The James Webb Space Telescope Mission. https://ntrs.nasa.gov/citations/20170010230
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