Type 1a supernova explosions are used by Astronomers as a standard candle for measuring distances in Astronomy.  They all explode with the same intrinsic brightness, and so depending on their apparent magnitude, ie how bright they look, we can determine the distance to them. It’s like a 40 watt light bulb.  No matter how far away I move it, it’s still 40 watts, even though it looks dimmer if it’s further away.  However, a few months ago some research came forward about type 1a supernova explosions, hinting that there may actually be two or more distinct types with slightly different...