Einstein made the revolutionary suggestion that gravity is not a force like other forces, but is a consequence of the fact that space-time is not flat, as had been previously assumed: it is curved, or “warped,” by the distribution of mass and energy in it. Bodies like the earth are not made to move on curved orbits by a force called gravity; instead, they follow the nearest thing to a straight path in a curved space, which is called a geodesic. A geodesic is the shortest (or longest) path between two nearby points.
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From the perspective of Systemic Functional Linguistic Theory, the presence of matter and energy contracts the intervals of the spatial dimensions — relative to their intervals in the absence of matter and energy — and it is the geodesic trajectory of a body moving through relatively contracted space intervals that is curved. Time, on the other hand, is the measure of the unfolding of the process, and, like space, its intervals are either expanded or contracted. (As will be seen in the next post, the presence of matter and energy expands the intervals of time.)
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