ispace APEX 1.0 lander
The APEX 1.0 lander from ispace U.S. Credit: ispace U.S.

WASHINGTON — Japanese lunar company ispace said work on a new engine for its lunar landers is facing delays and that it is keeping open the option of switching engines.

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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...