2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/221737This white paper briefly describes the astrophysics of ultra-compact binaries, with emphasis of the challenges and opportunities in the next decade.White paper for the the National Academies Astro2010 decadal surveySolar and Stellar AstrophysicsHigh Energy Astrophysical PhenomenaGeneral Relativity and Quantum Cosmologytext