UVEX
The Ultraviolet Explorer (UVEX) is a Medium-class Explorer mission that will conduct an all-sky ultraviolet survey. Credit: Caltech

WASHINGTON — NASA has selected four mission concepts for additional study in the latest round of an astrophysics program, but selected missions could face delays because of budget constraints.

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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...