#XRISM

A view down an X-ray astronomy instrument integration-hall corridor, a mirror-module shipping crate parked near a cleanroom airlock with one lid panel propped open against it

A Neutron Star Is a Redshift Standard

NICER lets a neutron star's surface calculate its own gravitational redshift to a few percent before any line is counted. A new paper argues that inversion turns a forty-year hunt for a line into the deepest equivalence-principle test physics currently has.

By Brecht Corbeel · October 4, 2026 · 13 min read

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