Gravity assist velocity diagram. From Byrnes, Dennis V.; Longuski, James M.; Aldrin, Buzz (1993). "Cycler orbit between Earth and Mars". Journal of Spacecraft and Rockets. 30 (3): 334–336. doi:10.2514/3.25519.
<a href="//commons.wikimedia.org/wiki/User:Hawkeye7" title="User:Hawkeye7">Hawkeye7</a>
<span class="int-own-work" lang="en">Own work</span>