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June 1, 2019 10:00 am

James Webb Space Telescope Emerges Successfully From Final Thermal Vacuum Test

NASA's James Webb Space Telescope has successfully cleared its final thermal vacuum test meant to ensure that its hardware will function electronically in the vacuum of space, and withstand the extreme temperature variations it will encounter on its mission. Phys.Org reports: One half of the Webb observatory, known as the "spacecraft element," completed this testing at the facilities of Northrop Grumman, the mission's lead industrial partner, in Los Angeles. The other half of Webb, which consists of the telescope and science instruments, has already successfully completed its thermal vacuum testing at NASA's Johnson Space Center in Houston prior to delivery at Northrop Grumman last year. In the most recent major environmental test, technicians and engineers locked the Webb spacecraft element inside a special thermal vacuum chamber. The testing team drained the atmosphere from the room to replicate the vacuum of space, and exposed the Webb spacecraft element to a wide range of hot and cold temperatures, spanning from minus 235 degrees Fahrenheit (minus 148 degrees Celsius) to a sweltering 215 degrees Fahrenheit (102 degrees Celsius). This variation of temperatures ensures the spacecraft will survive the extreme conditions it will actually experience in space. "The next steps will be to join both halves of Webb to form the fully assembled observatory and complete a final round of deployments, testing and evaluation prior to launch," the report adds. "A full deployment of the spacecraft element will verify that Webb is ready to proceed to the launch site."

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