EM-1 engines
The four RS-25 engines, which combined flew on 21 shuttle missions, that will be used for the first Space Launch System mission, EM-1.

A shift in focus in NASA’s exploration plans to the moon won’t have an immediate effect on planning for the first flight of the agency’s Space Launch System rocket, now expected no sooner than late 2019.

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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...