Pegasus Stargazer landing at KSC
Northrop Grumman's Pegasus XL rocket, seen here attached to its L-1011 aircraft, has suffered technical problems that has delayed the launch of a NASA satellite until the second quarter of 2019. Credit: NASA/Kim Shiflett

WASHINGTON — A persistent problem with a Pegasus rocket will keep a long-delayed NASA space science mission on the ground until at least this spring.

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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...