Aliens slowing down to observe Earth often are distracted by lighthouses. As aliens pass Earth in their spaceship they notice a lighthouse completes its circuit once every 8.0 s, however the lighthouse attendant has set the lighthouse to complete its circuit every 4.1 s from his point of view. How fast is the alien spaceship traveling in terms of the speed of light?
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![1 - \frac{v^2}{c^2} = [\frac{T_1}{T}] ^2](/tpl/images/0772/8104/f55fd.png)
![1 - \frac{v^2}{c^2} = [\frac{4.1}{8}]^2](/tpl/images/0772/8104/c6a3a.png)
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