Universe began with small volume, high energy, high mass-energy density, high temperature, high pressure, and high spatial curvature, and then rapidly expanded {Big Bang}, increasing spatial volume, decreasing mass-energy density, decreasing temperature, decreasing pressure, and decreasing spatial curvature.
All space points moved away from each other, so farther points moved away faster. From any space point (at any time), if a second point is at distance x and moves away from first point at velocity v, and a third point is at twice that distance 2*x, third point moves away from first point at velocity 2*v. If second point is between first and third points, first and third points move away from second point at same velocity v. Space has no central point or region. Big Bang was space expansion, not an explosion into existing space.
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Date Modified: 2022.0224