NASA spaceflight chief: “Amazing time” for building rockets at the agency

• NASA is making progress on building components of its Space Launch System rocket. Here, it has completed welding of a liquid oxygen tank. NASA

For most of the last five years, NASA's space launch system has been largely a PowerPoint rocket, consisting of designs on computers and disparate hardware in various stages of development across the United States. But now the massive SLS rocket is starting to come together, and senior NASA managers are optimistic about its future.

"This is an amazing period of time in US spaceflight," Bill Gerstenmaier, chief of human spaceflight for NASA, said last week during a meeting of the agency's advisory council. "I'm starting to see a real shift from just kind of hardware development to almost a flight cadence. The volume of work is just amazing." He added that with "roughly" two years to go before the first launch of SLS and the Orion spacecraft, the agency is beginning to test flight hardware.

Barring further delays, the maiden launch of SLS will occur between September and November 2018. Until now NASA has been mostly designing and building individual components of the massive rocket, which will have an initial capability to heft 70 metric tons to low-Earth orbit but may eventually grow into a 130-ton rocket. However, now the focus is turning toward testing that hardware and, later next year and in 2018, beginning to integrate it for launch.

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