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Source/Further reading:

Nasa, overview: https://solarsystem.nasa.gov/planets/mars/in-depth/

Britannica, Mars: https://www.britannica.com/place/Mars-planet

The Planets, BBC series - episode on Mars: https://www.bbc.co.uk/programmes/p06qj2qg

Perseverance so far: https://www.nature.com/articles/d41586-021-00698-5

Britannica, 10 important dates in Martian history: https://www.britannica.com/list/10-important-dates-in-mars-history

Microbial life on Mars? https://blogs.scientificamerican.com/observations/im-convinced-we-found-evidence-of-life-on-mars-in-the-1970s/

Subglacial lakes: https://www.nature.com/articles/d43978-020-00008-z

Subsurface water on ancient Mars? https://edition.cnn.com/2020/12/02/world/mars-subsurface-habitability-scn-trnd/index.html

Late Heavy Bombardment - a false theory? https://www.nature.com/articles/d41586-018-01074-6

NASA, timeline of human observation of Mars: https://www.nasa.gov/audience/forstudents/9-12/features/F_Mars_Chronology.html

Martian Canals: https://www.popularmechanics.com/space/moon-mars/a17529/a-short-history-of-martian-canals-and-mars-fever/

Mariner 4: https://www.nasa.gov/feature/55-years-ago-mariner-4-first-to-explore-mars

Spirit and Opportunity: https://www.nationalgeographic.com/science/article/nasa-mars-rover-opportunity-dead-what-it-gave-humankind

NASA manned mission: https://www.nasa.gov/topics/moon-to-mars/overview

Musk colonization plans: https://www.cnet.com/news/elon-musk-drops-details-for-spacexs-million-person-mars-mega-colony/

1911 NYT article “Martians Build Two Immense Canals in Two Years”: https://www.nytimes.com/1911/08/27/archives/martians-build-two-immense-canals-in-two-years-vast-engineering.html