WASHINGTON — NASA estimated it would have to cancel up to four commercial lunar lander missions and delay up to four more to fly a rover mission the agency announced in July it planned to cancel. NASA announced in July its intent to cancel the Volatiles Investigating Polar Exploration Rover (VIPER) mission, citing cost and schedule overruns and concerns of additional costs and delays in its launch, which was scheduled for September 2025. The agency said at the time that if it continued VIPER, the additional costs would have affected…
