NASA’s Webb telescope faces more setbacks
America’s next big space telescope has been delayed at least a year to May 2020, NASA said Tuesday, throwing the nation’s plan and budget for space astrophysics into potential turmoil.
It now seems likely the cost of the James Webb Space Telescope, the agency’s long-planned successor to the Hubble Space Telescope, will exceed an $8 billion limit that was imposed by Congress, meaning that the project will have to be reauthorized and other NASA missions could be jeopardized.
NASA is beefing up management overview of the program and has appointed an independent review board, chaired by Thomas Young, a former agency manager and a retired aerospace executive. The board is expected to report later this summer on what exactly needs to be done and how much it will cost.
The Webb telescope is a collaboration between NASA and the European Space Agency, “the largest international space science project in U.S. history,” in the words of NASA’s acting administrator Robert Lightfoot, who is retiring at the end of next month.
NASA had most recently scheduled the launch of the telescope from ESA’s site in French Guiana in the spring of 2019. Only a year-and-a half ago, NASA proudly showed off the telescope to reporters at the Goddard Space Flight Center in Maryland, saying it was on track after a decade of troubles and cost overruns that had put it on the verge of being canceled in 2011.
But that was before the telescope and its spacecraft were finally assembled and underwent testing at Northrop Grumman Aerospace Systems in Redondo Beach, Calif. There, unexpected problems arose, Thomas Zurbuchen, the agency’s associate administrator for science, said.
“A few mistakes happened,” he said. Among other things, a tennis-court sized sun shield — made of five thin layers of a material called kapton and designed to protect the telescope from outside heat — ripped during a practice deployment. And cables designed to keep the sun shield taut had too much slack and could have snagged during the real unfurling in space, a million miles from help.
The Webb telescope is designed to measure infrared, or “heat” radiation from the earliest stars and galaxies in the universe and from exoplanets. The sunshield is needed to keep the telescope cool, but it is too big to fit inside the Ariane rocket that will launch the telescope. Folded like origami, it was supposed to open once the Webb was launched into its final perch, out beyond the moon, a process that NASA engineers called “six months of high anxiety.”
But things didn’t go according to plan at Northrop Grumman. It took a month instead of the expected two weeks to unfold the sunshield, Zurbuchen reported, and refolding it, which they had estimated would take a month, took two months.
“We have one shot to get this right,” he said. “Failure is not an option.”
Some worried that the Wide Field Infrared Survey Telescope, a highly rated mission to investigate dark energy and the expansion of the universe, could be in danger. “It’s possibly going to be the telescope that kills NASA astrophysics,” said Brian Keating, a cosmologist at the University of California, San Diego.