Changes

==Time dilation==

==Time dilation==

[[Image:Light cone.png|right|thumb|Light-cone diagram]]

[[Image:Light cone.png|right|thumb|Light-cone diagram]]

One important consequence of SR's postulates is that an observer in one reference frame will observe a clock in another frame to be "ticking" more slowly than in the observer's own frame. This can be proven mathematically using basic geometry.

One important consequence of SR's postulates is that an observer in one reference frame will observe a clock in another frame to be "ticking" more slowly than in the observer's own frame. This can be proven mathematically using basic geometry, if the postulates are physically true without exception.

The length of an event <math>t</math>, as seen by a (relative) stationary observer observing an event is given by:

The length of an event <math>t</math>, as seen by a (relative) stationary observer observing an event is given by: