Cosmology2026-06-233 minarXiv:2606.25205Supernova Echoes: A Fresh Measure of the Hubble ConstantThroughout the last century, cosmology measured the universe's expansion rate using supernovae, redshifts, and the cosmic microwave background.L. Bazzanini·G. Di Rosa·A. Acebron·P. Bergamini·M. Lombardi·P. Rosati·G. Angora·G. B. Caminha·S. Ertl·G. Granata·A. M. Koekemoer·S. H. Suyu·J. Pierel·A. B. Newman·C. Grillo·S. Schuldt·M. Bulla·S. Cha·M. D'Addona·J. M. Diego +7Hubble's lawEinstein field equationsHendrik LorentzChristian DopplerAlbert EinsteinEHTHubble Space TelescopeHubble Space Telescopegravitational lensing👍👎☆SimplePopularAdvanced