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A comment on Supernova’s messy birth casts doubt on reliability of astronomical yardstick. Parent comment

Re:Supernova’s messy birth casts doubt on reliability of ast... by JumpCrisscross on Sunday August 20, 2017 @10:30PM (#15061512)
How would you explain, to a layman, why standard candles--phenomena we must measure from great distances--are trusted to be as consistent as well believe them to be?
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Re:Supernova’s messy birth casts doubt on reliability of ast... by carljoseph on Sunday August 20, 2017 @10:55PM (#15061602)
It's essentially built up of a chain or ladder. From parallax measurements to cepheid variables to supernova. This might give a good introduction http://www.iop.org/resources/topic/archive/cosmic/
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