It's thanks to a super-precise launch, NASA says.
."The extra propellant is largely due to the precision of the @Arianespace Ariane 5 launch, which exceeded the requirements needed to put @NASAWebb on the right path, as well as the precision of the first mid-course correction maneuver."
That said, the agency noted that it can't provide a specific estimate for how long the observatory will last. "The analysis shows that less propellant than originally planned for is needed to correct Webb's trajectory toward its final orbit," officials wrote in the statement."Consequently, Webb will have much more than the baseline estimate of propellant — though many factors could ultimately affect Webb's duration of operation.
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