WASHINGTON — Four NASA exploration projects that the agency stopped earlier this year as part of changes to its Artemis lunar exploration campaign had suffered overruns that saw their costs more than double, with more than $1 billion in additional increases expected.

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Jeff Foust writes about space policy, commercial space, and related topics for SpaceNews. He earned a Ph.D. in planetary sciences from the Massachusetts Institute of Technology and a bachelor’s degree with honors in geophysics and planetary science...