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18 March 2010
This is Getting Boring: General Relativity Passes Yet another Big Test!
Published in 1915, Einstein's theory of general relativity (GR) passed its first big test just a few years later, when the predicted gravitational deflection of light passing near the Sun was observed during the 1919 solar eclipse. In 1960, GR passed its first big test in a lab, here on Earth; the Pound-Rebka experiment. And over [...]
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21 February 2010
Dark Matter in Distant Galaxy Groups Mapped for the First Time
Galaxy density in the Cosmic Evolution Survey (COSMOS) field, with colors representing the redshift of the galaxies, ranging from redshift of 0.2 (blue) to 1 (red). Pink x-ray contours show the extended x-ray emission as observed by XMM-Newton. Dark matter (actually cold, dark – non-baryonic – matter) can be detected only by its gravitational influence. In [...]
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