r&#x2F;SpaceX has a lot of good info.  Check out the &quot;What are the differences between the Falcon 9 v1.1 and the upgraded Falcon version popularly called the v1.2?&quot; FAQ here: <a href="https:&#x2F;&#x2F;www.reddit.com&#x2F;r&#x2F;SpaceX&#x2F;wiki&#x2F;faq&#x2F;falcon" rel="nofollow">https:&#x2F;&#x2F;www.reddit.com&#x2F;r&#x2F;SpaceX&#x2F;wiki&#x2F;faq&#x2F;falcon</a><p>This Wikipedia page has a mention of super-chilling: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;RP-1" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;RP-1</a>