Artist's concept of a four-engine Exploration Upper Stage for NASA's Space Launch System.

Tuesday’s briefing begins with NASA pressing ahead with plans to use a more powerful upper stage on the second flight of the Space Launch System despite conflicting budget language.

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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...