Q Part 1: State why a white dwarf becomes a violent Type 1A supernova, instead of a gentle nova explosion, depending on where fusion restarts. Then, briefly explain why the Chandrasekhar limit allows astronomers to estimate distances far beyond the what is possible with the old parallax method (like Tycho Brahe used). Part 2: Briefly cover the key difference between Type 1A and Type 2 supernovae.
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