NASA cancels SLS Block 1B and rewrites Artemis roadmap to target lunar landing by 2028
NASA administrator Jared Isaacman has cancelled the SLS Block 1B and overhauled the Artemis roadmap to accelerate a crewed lunar landing by 2028. The revision aims to speed lunar return by pivoting architectures and schedules, with NASA keeping open the possibility of two landings in 2028.