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Observations of the James Webb Space Telescope from -369.7 Degrees Fahrenheit
Taken in September 2017 from inside Chamber A at the Johnson Space Center in Houston, Texas, while the combined optical and science instrument element of the James Webb Space Telescope was undergoing cryogenic testing, the temperature at the time this image was taken was approximately 50 kelvins (about -369.7 degrees Fahrenheit/-223.2 degrees Celsius). In the photo, you can see each of WebbÕs 18 hexagonal primary mirror segments, though the ones further from the camera quickly fade into darkness. The bright elements in the photo - the "stars" that seem to envelop Webb within the chamber - are targets that were used to measure extremely precise movements of the telescope as it cooled. Those targets appear so bright because this photo had a very long exposure time. Webb's combined optical, and science instrument element completed cryogenic testing inside the chamber in November 2017. NASA Photo by Chris Gunn/UPI
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