observations and physical characterisation have grown exponentially

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A Question And Answer Guide To Astronomy Size:EN STL observations and physical characterisation haveAre we alone in the Universe? Was there anything before the Big Bang? Are there other universes? What makes stars shine? Where does Earth's water come from? Why is the night sky dark? Was there ever life on Mars? How do telescopes work? A question and answer guide to astronomy, Authors: Carol Christian, Space Telescope Science Institute, Baltimore ,Jean Ren Roy, Gemini Observatory, La Serena, Chile This engaging guide book answers all these questions