If Elon Musk visits Mars before the earlier of his death or Aug 1, 2099, then the market resolves to Yes. Sources from The Guardian, official representatives or offices of <person>, Fox News, official social media accounts of <person> or their official representatives, Semafor, The Information, CNBC, the Associated Press, The Wall Street Journal, CNN, Politico, MSNBC, The Washington Post, Reuters, local news outlets with verifiable mastheads in <area>, official government sources of <area>, and The New York Times.