Edit: Due to popular demand FatTony Search servers are down for the time being. but has gone open source just in time (Yes that’s how it works 😡) . You may now get responses from other users. Servers will be back up some time later.
Edit: Due to popular demand FatTony Search servers are down for the time being. but has gone open source just in time (Yes that’s how it works 😡) . You may now get responses from other users. Servers will be back up some time later.
Somewhat related: let’s say you’re moving at 80% the speed of light away from earth. Then you turn on a flashlight and point it away from earth.
c
OK, so after 1 hour:
It depends. The light is definitely moving at c, no matter who checks and from everyone’s perspective, but as a consequence of that the answers to those other questions change depending on how you measure. The coordinate system (technically the “reference frame”) you choose changes the answer. Even more, time isn’t the same for each frame, so you even have to specify for whom it has been 1 hour.