If an object is moving in a general way, we can identify the different kinds of motion involved: By measuring how far that object progresses in parallel to the axis, we determine its axis motion by measuring how its distance from the axis changes, its radial motion by tracking its motion sideways around the axis, its angular motion. An object in pure angular motion will trace out a circle around the central blue axis. The third is motion perpendicular to the other two, which we shall call angular motion. The second is radial motion – either directly towards the blue axis, or directly away from it. The first has objects moving parallel to the blue axis – either directly upwards or downwards -, so let’s call this axis motion. We can define three distinct types of motion. Let’s look at objects moving around in this space. In the middle of this space, we draw an axis – in the following image the vertical blue line: Let’s start by looking at three-dimensional space in a specific way. Visualizing the geometry of familiar three-dimensional space, though admittedly with some additional assumptions that will seem contrived, it is possible to understand an important aspect of the way that a black hole isolates its interior from the rest of the universe. Traffic rules for our three-dimensional space with axis.
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