Tuesday, April 23, 2013

ScienceDaily: Stars News

ScienceDaily: Stars News

Grains of sand from ancient supernova found in meteorites: Supernova may have been the one that triggered the formation of the solar system

Posted: 22 Apr 2013 08:12 AM PDT

Scientists have discovered two tiny grains of silica (SiO2; the most common constituent of sand) in meteorites that fell to earth in Antarctica. Because of their isotopic composition these two grains are thought to be pure samples from a massive star that exploded before the birth of the solar system, perhaps the supernova whose explosion is thought to have triggered the collapse of a giant molecular cloud, giving birth to the Sun.
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