Illustration of addition of velocities for <a href="https://en.wikiversity.org/wiki/Special_relativity_and_steps_towards_general_relativity" class="extiw" title="wikiversity:Special relativity and steps towards general relativity">Wikiversity:Special relativity and steps towards general relativity</a> from the point of view (rest frame) of a space ark travelling at high speed away from the Earth.
<a href="//commons.wikimedia.org/wiki/User:Boud" title="User:Boud">Boud</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>