I was looking at some space-time diagrams with the simultaneity surfaces for moving inertial observers in SR and looking at the picture an interesting thought came up to my mind. It is known that the causal structure of the universe is preserved in SR, and that cause always comes before the effect. But what about spacelike events? Can any two spacelike events in Minkowskian spacetime be simultaneous?(adsbygoogle = window.adsbygoogle || []).push({});

For instance, let's imagine that we have a rod that is not very long, let's say 1m in its rest frame. Let's imagine that the rod is actually very durable in time, so let's imagine that from the perspective of its rest frame we have a situation where one event on the first end of the road (which is spacelike separated from the other) exists 1 hour after the second event on the second half of the road. Can those two events be simultaneous, despite that one trails in time by a very big margin as viewed from its rest frame. To sum up, can any two non-causally related events be simultaneous, no matter how much they are separated in time as viewed from one frame.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Can any pair of spacelike events be simultaneous?

Loading...

Similar Threads for pair spacelike events |
---|

I No universal chronological order of events? |

I Event Horizons - Holographic Principle |

I Black hole event horizon confusion |

A Difference between event horizons and trapped surfaces |

I Can overlapping event horizons be seperated? |

**Physics Forums | Science Articles, Homework Help, Discussion**