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Calvera (X-ray source) - Wikipedia
Calvera Is Earth's Closest Neutron Star - Science 2.0
Earth’s neutron-star neighbor - Astronomy Magazine
Possible Closest Neutron Star to Earth Found
Possible closest neutron star to Earth found - SpaceNews
Calvera Star Facts (Type, Colour and others) - Universe Guide
Astronomers Find Closest Neutron Star | Space