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AstronomySuper Data: Hail the cosmic revolution
Ten extremely distant supernovas recently discovered by the Hubble Space Telescope provide evidence that something is pushing objects in the cosmos apart at an ever-faster rate.
By Ron Cowen -
EarthWhen Genes Escape
The focus of the debate over transgenic crops has changed from whether genes will escape to what difference it will make when they do.
By Susan Milius -
EarthScrutinized chemicals linger in atmosphere
The newly determined longevity in the atmosphere of certain perfluorinated chemicals indicates that they may disperse environmental contamination far and wide.
By Ben Harder -
PhysicsCassini confirms Einstein’s theory
En route to a 2004 rendezvous with Saturn, the Cassini spacecraft has verified a key prediction of Einstein’s theory of general relativity to an accuracy 50 times better than that of previous measurements.