SLS mobile launcher
The mobile launcher, originally built for the Constellation program, undergoing upgrades for the first SLS launch. NASA is considering whether to modify it again for later SLS missions or build a new one.

NASA has issued a call for proposals to construct a second mobile launch platform that will be used by an upgraded version of the Space Launch System rocket starting in the early 2020s.

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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...