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China also announced today that they will launch Chang’e-5, their lunar sample return mission, by the end of this year, followed in 2020 by a Mars probe. Both launches will require use of the Long March 5.
The 5B appears to be a redesigned version of the 5, which has launched twice but failed on its second launch in 2017. Since then all launches of the Long March 5 ceased, with hints in the press that the failure occurred because the rocket’s first stage engines had badly underperformed and required a complete redesign. This redesign caused significant delays in the launch of Chang’e-5, China’s space station, and its Mars probe.
Today’s announcements suggest that that engine redesign is probably complete, and that they are now ready to resume Long March 5 launches, including the upgraded and revised 5B.