Posts Tagged ‘Relative Velocities’

Einstein in four *spatial* dimension

Why many physicists chose to define the universe in terms of the physical properties of a time or space-time dimension instead of four *spatial* dimensions is puzzling because, as was shown in the earlier article "Defining time" Sept 20, 2007 there is no observational evidence supporting it having physical properties.  Gravity and space-time But even […]

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Mass from first principles

TweetEinstein told us that energy and mass are interchangeable in terms of the geometry of space-time however he did not define what mass is.  He only told us how mass interacts with it. As Steven Weinberg said "Mass tells space-time how to curve while space-time tells mass how to move". In other words Einstein did […]

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