here - Department of Physics, HKU
here - Department of Physics, HKU
here - Department of Physics, HKU
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CHAPTER 5. PARADOXES 34<br />
ct<br />
x<br />
Figure 5.1: Observer on Earth sent out light signals every ten years. The bold<br />
line represents the trajectory <strong>of</strong> a space ship going away and then coming<br />
back.<br />
ct<br />
x<br />
Figure 5.2: Observer in a space ship sent out light signals every ten years.
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