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.
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?