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NASA probe Galileo finds traces of a hidden ocean on Ganymede, Jupiter's largest moon, and also decides the time is right to send a probe to Pluto. Big Bang theory proved by the discovery of "hot" microwaves in space. Ancient Egyptian sunken cities of Heracleion and Menouthis, discovered in the Mediterranean Abu Qir Bay, show signs of destruction by earthquake. Plus, giant 55-metre-high hydrothermal chimneys found in the Atlantic.