The chief executive of United Launch Alliance said Nov. 9 that he doesn’t feel any urgency to select a main engine for his company’s next-generation Vulcan rocket, despite an impending deadline for an Air Force launch competition.

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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...