<p><img src="https://imgs.xkcd.com/comics/gravity_wells.png" alt="This doesn&#x27;t take into account the energy imparted by orbital motion (or gravity assists or the Oberth effect), all of which can make it easier to reach outer planets."></p>
<blockquote>
<p>"<a href="https://xkcd.com/681/">Gravity Wells</a>", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License</p>
</blockquote>
<h2 id="alt-text"><a aria-hidden="true" class="anchor-heading" href="#alt-text"><svg aria-hidden="true" viewBox="0 0 16 16"><use xlink:href="#svg-link"></use></svg></a>Alt Text</h2>
<p>This doesn't take into account the energy imparted by orbital motion (or gravity assists or the Oberth effect), all of which can make it easier to reach outer planets.</p>

xkcd

Gravity Wells


# XKCD

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