There is an XKCD &quot;what if&quot; that explains this: <a href="https:&#x2F;&#x2F;what-if.xkcd.com&#x2F;58&#x2F;" rel="nofollow">https:&#x2F;&#x2F;what-if.xkcd.com&#x2F;58&#x2F;</a><p>&quot;The reason it&#x27;s hard to get to orbit isn&#x27;t that space is high up. It&#x27;s hard to get to orbit because you have to go so fast.&quot;