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Learn about the science of Astronomy with iMinds insightful knowledge series. The human desire to know what we see when we look in the sky is so great that a branch of science has been dedicated to it: astronomy. Astronomy is the study of the material universe outside the earth's atmosphere. Astronomers research and make estimations about our universe and outer space in general. Human beings have been gazing up at the sky since before written history began. However, what human beings knew about this outer space region amounted to very little until relatively recently. The ancient philosopher Claudius Ptolemy wrote on astronomy in the second century. His main book is called Almagest, which translates as "great work." iMinds brings targeted knowledge to your eReading device with short information segments to whet your mental appetite and broaden your mind.