Article: Knocking on heaven's door. (orbiting observatories)

Ever since Galileo turned the first telescope skyward in 1609, each improvement in astronomical instruments has uncovered phenomena that sparked new questions about the violent forces shaping the universe. Last week was no exception: Scientists at the American Astronomical Society meeting in Atlanta presented more than 80 papers, trying to explain the recent flood of data from the National Aeronautics and Space Administration's two huge orbiting observatories, the Compton Gamma-Ray Observatory and the partly crippled Hubble Space Telescope.

Compton has been flying only since April, but its early results have already touched off a debate about a mysterious cosmic ...

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