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  1. Calvera (X-ray source) - Wikipedia

  2. Calvera Is Earth's Closest Neutron Star - Science 2.0

  3. Earth’s neutron-star neighbor - Astronomy Magazine

  4. Possible Closest Neutron Star to Earth Found

  5. Possible closest neutron star to Earth found - SpaceNews

  6. Calvera Star Facts (Type, Colour and others) - Universe Guide

  7. Astronomers Find Closest Neutron Star | Space