High Energy2026-01-172 minarXiv:2601.11917expressA pulsar with a heartbeat of 6.67 hoursThe neutron star 1E 161348-5055 in the supernova remnant RCW 103 pulses with a period of 6.67 hours. That's very slow for such a compact object, and astronomers long puzzled over what was going on.Kazuo Makishima·Nagomi Uchida·Teruaki EnotoAlan GuthAlbert EinsteinCharles Townespulsarneutron star👍👎☆SimplePopularAdvanced