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On the largest of scales, some cosmologists continue to believe that our universe has the geometry of a sphere. Why do they believe this? Because Einstein’s theory of General Relativity declares that space is curved – due to the gravitational influence of large mass objects like our Sun.Is space flat or curved? As you’ll see in this book, recent astronomical observations show that our universe is straight-lined, and not curved. This means that space is flat.Question: If space is flat, would this mean that Einstein’s principle of curved space has been overturned?Answer: We believe it has. Einstein’s theory of gravity appears to be overturned by observations that show a perfect [or nearly perfect] flatness of space. Moreover, this flatness applies everywhere in the cosmos.