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It seems we now know more about outer space than we do about the Earth's core. This is because temperatures are so great high at the centre of the Earth that human beings have not been able to take a close look at it. However, new techniques methods of analysis may soon change all that. The seismic waves formed created by earthquakes and volcanic eruptions penetrate the Earth's layers at different speeds. It is now hoped that by studying these waves, scientists will be able to make new findings discoveries and solve some of the mysteries of the inside internal structure of the Earth.