SLS on pad Sept. 3
Controllers called off a second attempt to launch the SLS Sept. 3 after failing to fix a liquid hydrogen leak detected shortly after fueling started.

NASA called off a second attempt to conduct the inaugural launch of the Space Launch System Sept. 3 after failing to resolve a liquid hydrogen leak during fueling of the rocket.

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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...