https://www.space.com/16875-how-far-away-is-mars.html
https://www.cnn.com/2020/05/23/us/nasa-isolation-scn-trnd/index.html?utm_source=twCNN&utm_term=link&utm_content=2020-05-23T17%3A11%3A02&utm_medium=social
https://www.nasa.gov/feature/sirius-crew-returns-from-moon-nearly-50-years-after-apollo-11
https://www.nasa.gov/feature/goddard/2019/how-nasa-protects-astronauts-from-space-radiation-at-moon-mars-solar-cosmic-rays
https://www.theverge.com/2016/8/1/12322266/nasa-astronaut-scott-kelly-interview-deep-space-travel-psychological-effects
https://www.forbes.com/sites/ellistalton/2018/09/06/communications-infrastructure-on-mars-could-be-the-envy-of-earth/#59ef89723706
https://www.space.com/21353-space-radiation-mars-mission-threat.html
https://www.asc-csa.gc.ca/eng/sciences/osm/bones.asp
https://science.nasa.gov/science-news/science-at-nasa/2001/ast01oct_1/
https://www.space.com/crewed-mars-mission-astronaut-dangers.html
https://www.space.com/25392-manned-mars-mission-astronaut-vision.html
https://www.space.com/23017-weightlessness.html
https://www.smithsonianmag.com/science-nature/inside-nasa-plan-send-humans-mars-180958787/