mcdonaldobservatory.org - McDonald Observatory | Visitor information, teacher workshops, public programs in Fort Davis, Texas

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radiouniverso.org - Universo Online | Su Guia para el Universo

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blackholes.stardate.org - StarDate's Black Hole Encyclopedia - The latest black hole news and details on the best-known individual black holes

telescopes.stardate.org - Galileo to Gamma Cephei - The History of the Telescope

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hetdex.org - Illuminating the Darkness - HETDEX

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