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Thursday, 19 May 2016

Earth and Beyond

A Asteroid B Black hole C Comet D Direct motion E Eclipse F Flares G Galaxy H Hubble constant I Ionosphere K Kirk Wood gaps L Local group M Magnetosphere N  Neutron star O Oblate spheroid P Parallax Q Quasar R Radiant S Synodic period T Terminator U Umbra V Variable star Z Zenith

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