Measuring cosmic distances is challenging, and astronomers rely on multiple methods and tools to do it – collectively referred to as the cosmic distance ladder.
, which occur in binary systems where one star consumes matter from a companion until it reaches the Chandrasekhar limit and collapses under its own mass.
As these stars blow off their outer layers in a massive explosion, they temporarily outshine everything in the background.Oskar Klein CentreIllustration of a"type Ia" supernova. When the white dwarf reaches an estimated 1.4 times the current mass of the Sun, it can no longer sustain its own weight and collapses. (
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