Type Ia supernovae (SNe Ia) continue to of high importance for measuring the current expansion rate of the universe, parameterized by the Hubble Constant, and for dark energy. For both of these measurements, relations between properties of the SNe and properties of the host galaxies have recently been brought up to reconcile the Hubble constant tension and even show that the universe is not actually accelerating. In this talk, I will present an overview of the latest findings and show the actual impact these relations have on cosmological measurements. I will then present a new theory to explain some of the key questions about how SN Ia physics is tied to host galaxy properties, and what we can learn from the thousands of supernova being discovered in the next few years.
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