… hydrogen fusion begins at temperatures of approximately 4,000,000 K, which requires at least 1.6 × 1029 kg of mass to collapse down into a star. Once hydrogen fusion ignites, however, the outward flux be…This one imperfection in nuclear physics allowed Earth to exist48515Ethan SiegelJames WarrenFollowJul 23, 2017 · 1 min readWhoops 10²⁹