<br /> Elon Musk mistook the moon for Mars in a tweet — and the internet is calling him out.<br />According to Business Insider, The SpaceX CEO tweeted a picture of the moon with the caption "Occupy Mars" . Twitter users were quick to point out that the image was not of the red planet, but of the moon during the July 2018 lunar eclipse — a phenomenon known as the blood moon. <br />
