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In this Exploration we will be considering different aspects of the so-called twin paradox. Restart. At t = 0 years the traveling twin (represented by the green circle) heads out on her journey and then returns at t = 10 years (position given in lightyears). In the top panel the spacetime diagram for the stationary frame is shown.
Select Pulses from Traveling Twin and play. Also shown are the stationary observer's clock and the clock that the moving observer's clock as seen by the stationary observer.
Select Pulses from Traveling Twin: ST and play. One way to see what is going on with the twin's pulses is to see the pulses depicted as blue lines on the spacetime diagram.
Select Stationary Twin Actually Sees This and play. The orange circle and the orange trajectory on the spacetime diagram represent what the stationary twin would actually see accounting for the time delay (Therefore the orange trajectory on the spacetime diagram is not a true worldline).