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The most important discoveries in 2009
*Extrasolar planets: astronomers directly imaged 2 exoplanet systems, found the lightest exoplanet yet orbiting a normal star, two planets were found to orbit their stars backwards, the first...
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Where does the most distant galaxy cluster hide?
The youngest and most distant galaxy cluster (image: NASA/CXC/INAF/S.Andreon et al, DSS; ESO/VLT) Speed of light is very important in astronomy. Due to the vast distances involved, it can take a very...
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