Place your fingertips on Flatland - you appear to them in many places at once. So as a three-dimensional being, your actions would violate the Flatlanders' laws of physics. The laws of 2D space as understood by 2D beings would restrict light (and everything else) from moving up and down in fact, there would be no up or down. If it helps, draw Flatland and its residents on a sheet of paper and place it flat on a table in front of you. #Gravity as curved space activity full#To assist you in imagining space curved in four dimensions, pay a visit to Flatland, a two-dimensional world full of square, triangular, and circular beings. Some theoretical equations incorporate many other "dimensions" - velocity, temperature, or density, for example. In this way, time merely serves as a yardstick for our personal experiences and our laws of physics. Unlike width, length, and height, we only know time to move in one direction: past to present to future. In Einstein's Theories of Relativity, time helps us understand the three-dimensional experience of gravity.īut time is not a true spatial dimension like the three we're familiar with. This is the stage on which planets, stars, galaxies - all matter in the universe - act their gravitational roles. Einstein used time as a fourth dimension to describe a coordinate system called space-time. Many people think the fourth dimension is simply time, and for some astronomical equations, it is. Space is indeed curved - in four dimensions.
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