Physics Help Forum Simultaneous in all inertial frames
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 Oct 21st 2018, 05:50 AM #1 Junior Member   Join Date: Oct 2018 Posts: 1 Simultaneous in all inertial frames The question I have says that a comet is travelling at speed v and people are having a party to celebrate the crashing of the comet. If the comet has to travel 8x10^11 m then how long do they need to have a party for, for the party to be simultaneous with the crash in all inertial frames? My attempt: Wouldn't it be an infinitely long party? This is just my general assumption. I'm not too sure how to use the Lorentz Transformations to help me
 Oct 21st 2018, 09:00 AM #2 Physics Team   Join Date: Apr 2009 Location: Boston's North Shore Posts: 1,576 That can't happen. Simultaneity is frame dependent. topsquark likes this.
 Oct 22nd 2018, 02:51 AM #3 Senior Member     Join Date: Jun 2016 Location: England Posts: 963 As PMB indicates, you would have to be very careful about how you define "simultaneous" Each "inertial frame" would have its own "instant of simultaneity" with the impact. If you were to have 2 comet impacts, each being celebrated by parties in the different inertial frames, then the length of time between parties in different frames would differ. topsquark likes this. __________________ ~\o/~

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