<p><img src="https://imgs.xkcd.com/comics/possible_undiscovered_planets.png" alt="Superman lies near the bird/plane boundary over a range of distances, which explains the confusion."></p>
<blockquote>
<p>"<a href="https://xkcd.com/1633/">Possible Undiscovered Planets</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>Superman lies near the bird/plane boundary over a range of distances, which explains the confusion.</p>

xkcd

Possible Undiscovered Planets


# XKCD

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