ScienceDaily: Astronomy News

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Using black holes to measure the universe's rate of expansion Posted: 22 Apr 2013 09:30 AM PDT Scientists have developed a method that uses black holes to measure distances of billions of light years with a high degree of accuracy. The ability to measure these distances will allow scientists to see further into the past of the universe than ever before.

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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