SLS LC-39B
The SLS at Launch Complex 39B ahead of its wet dress rehearsal, set to start April 1 and last two days.

NASA says it’s ready to go ahead with a practice countdown of the Space Launch System that will serve as a final key test before the rocket’s first launch, but one that will also take place largely out of public view.

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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...