The acting associate administrator for human exploration and operations at NASA, Ken Bowersox, said that current schedules calling for a late 2020 first launch of SLS are "very, very aggressive" that that the launch may slip well into 2021.

With growing bipartisan skepticism that NASA’s current plan to return humans to the moon by 2024 is achievable, members of the House Science Committee used a Nov. 13 hearing to advocate for a different, and arguably more conventional, approach.

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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...