Elon Musk posted an article &quot;BACKGROUND ON TONIGHT&#x27;S LAUNCH&quot; on SpaceX&#x27;s website 15 minutes before the launch.<p>Link : <a href="http:&#x2F;&#x2F;www.spacex.com&#x2F;news&#x2F;2015&#x2F;12&#x2F;21&#x2F;background-tonights-launch" rel="nofollow">http:&#x2F;&#x2F;www.spacex.com&#x2F;news&#x2F;2015&#x2F;12&#x2F;21&#x2F;background-tonights-la...</a>