The 'Mars (of Which the Moon Is a Part)' meme originated from a confusing tweet sent by President Donald Trump in June 2019. While criticizing NASA's focus on lunar missions, the tweet included a parenthetical statement that appeared to claim the Moon was geographically or scientifically a part of Mars. The internet immediately seized on the bizarre phrasing, creating countless parodies that redefine basic geography or logical sets. It is commonly used to mock confidently incorrect statements or to create absurd hierarchies where one unrelated thing is claimed to be a subset of another, mirroring the original astronomical gaffe.