Green Run engines
NASA said the Green Run static-fire test Jan. 16 was terminated when the hydraulic system for one of four engines hit a limit intended to be conservative in order to protect the core stage.

Just days after NASA said it was ready to perform a second static-fire test of the Space Launch System core stage, the agency announced Feb. 22 that the test would be delayed because of a valve problem.

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Jeff Foust has more than a decade of experience writing about space policy, entrepreneurial ventures and regulatory affairs. In 2001, he established spacetoday.net to aggregate and summarize the day's space-related news stories. In 2003, he started The...