Cosmic Ruler Flawed
April 13, 2015
Type 1a supernovae, vital to estimates of the size and expansion of the universe, are not uniform. This has cosmic implications.
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Supernova Dating and Classification Is Not Simple
September 30, 2012
Bang! goes a star. Watch how fast its contents move, and you know the date, right? Watch its light curve, and you know the type, right?