Years after shuttle, NASA rediscovers the perils of liquid hydrogen

‍A more in-depth overview of today's scrub, the road ahead for the SLS rocket, and the smallest element in the universe.

NASA sought to launch a rocket largely cobbled together from the space shuttle, which itself was designed and built more than four decades ago.

As the space shuttle often was delayed due to technical problems, it therefore comes as scant surprise that the debut launch of NASA's Space Launch System rocket scrubbed a few hours before its launch window opened...

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@EverythingScience