Why It's So Hard to Land on Mars

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We’ve sent more spacecraft to Mars than any other planet, but around half of the probes that have ever attempted to explore Mars have either crashed or disappeared.

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Sources:

https://www.space.com/25497-how-mars-landings-work-infographic.html
https://mars.nasa.gov/mars2020/mission/overview/
https://youtu.be/Ki_Af_o9Q9s
http://newscenter.lbl.gov/2017/02/22/building-heat-shield-mars-mission/
http://www.planetary.org/blogs/emily-lakdawalla/2012/06221711-how-curiosity-land-part-1.html
https://mars.nasa.gov/mars2020/mission/timeline/entry-descent-landing/
https://phys.org/news/2018-03-success-largest-mars-mission-parachute.html
https://mars.nasa.gov/mer/mission/spacecraft_edl_aeroshell.html
https://mars.nasa.gov/mer/mission/spacecraft_edl_parachute.html
https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19650020588.pdf
https://www.space.com/16777-curiosity-rover-many-mars-missions.html
https://mars.nasa.gov/programmissions/missions/log/
https://blogs.scientificamerican.com/guest-blog/sky-crane-how-to-land-curiosity-on-the-surface-of-mars/
https://www.nasa.gov/pdf/737628main_Final_LDSD_Fact_Sheet_3-26-13.pdf

Images:

https://svs.gsfc.nasa.gov/13016
https://en.wikipedia.org/wiki/File:NASA-Apollo8-Dec24-Earthrise.jpg
https://images.nasa.gov/details-GRC-2017-CM-0124.html
https://en.wikipedia.org/wiki/File:Mars_atmosphere.jpg
https://photojournal.jpl.nasa.gov/catalog/PIA14834
https://svs.gsfc.nasa.gov/12962
https://www.nasa.gov/mission_pages/mars/images/msl0153-20090422.html
https://youtu.be/XvVOgS9jWn0?t=1673
https://www.youtube.com/watch?v=P4boyXQuUIw
https://mars.nasa.gov/mars2020/multimedia/videos/?v=399
https://svs.gsfc.nasa.gov/13016