Ah, I see- check the definition. :) The cone-shape is provided by the time axis for visualization convenience.
In reality, there are three space dimensions, so the light would actually form an expanding or contracting sphere in 3D space rather than a circle in 2D, and the light cone would actually be a four-dimensional shape. However, the concept is easier to visualize with the number of spatial dimensions reduced from three to two. - wikipedia
..."Light hyper-cone" does have a certain ring to it though.
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Date: Sunday, 7 March 2010 01:58 pm (UTC)In reality, there are three space dimensions, so the light would actually form an expanding or contracting sphere in 3D space rather than a circle in 2D, and the light cone would actually be a four-dimensional shape. However, the concept is easier to visualize with the number of spatial dimensions reduced from three to two. - wikipedia
..."Light hyper-cone" does have a certain ring to it though.