The paper proposes that Kepler's supernova progenitor may come from a merged satellite galaxy and estimates that alien Type Ia supernovae occur at roughly 2 to 5 per 100,000 years.
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Alien Type Ia supernovae from the Milky Way merger history and one possible candidate: Kepler's supernova
The paper proposes that Kepler's supernova progenitor may come from a merged satellite galaxy and estimates that alien Type Ia supernovae occur at roughly 2 to 5 per 100,000 years.