AstronomyTeacher
News articles and posts about astronomy and astronomy educationSaturday, January 06, 2007
Stellar Bang with a New Twist -- Berardelli 2007 (105): 2 -- ScienceNOW
Stellar Bang with a New Twist -- Berardelli 2007 (105): 2 -- ScienceNOW: "For years, astronomers have relied on a valuable observational tool to study the expansion of the universe: a variety of supernova called a Type Ia. These titanic explosions were thought to erupt under conditions that produced a consistent brightness. Using that 'standard candle,' astronomers could calculate a supernova's distance from Earth and, by detecting stretches in the wavelengths of its light, also track the acceleration of the universe caused by the mysterious force called dark energy. Now, the discovery of two supernova remnants in a nearby galaxy calls the consistency of Type Ia explosions into question."
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