SLS Green Run
The core stage of the Space Launch System fires its four main engines during an abbreviated test Jan. 16 at the Stennis Space Center in Mississippi.

NASA will carry out a second hotfire test of the Space Launch System core stage, a move that makes it more likely the vehicle will miss its scheduled launch date of late this year.

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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...