evidence: Flat earth conspiracy theorists have been mocked after Elon Musk's SpaceX rocket launch gave us new images showing the world was round. [...] Musk has previously mocked the Flat Earth Society, tweeting: "Why is there no Flat Mars Society!?" after posting a beautiful photo of the red planet. The group's official Twitter account actually replied to answer his question, saying: "Hi Elon, thanks for the question. Unlike the Earth, Mars has been observed to be round." [...] Reddit users also mocked flat earthers, telling them to "take that". One user suggested Musk had missed a chance to prove the earth was round once and for all: "He really should have sent a flat earther up there with him so they would shut up about flat earth."