What are the dangers and or challenges going to Mars

Hello,

I had been on youtube for a while , I try to provide space exploration , gaming , computer repair tutorial and generally informative videos

Here’s the timeline for all the important details

Intro 0:00
Power Plant 6:51
Energy Storage 10:05
Backup Power 13:02
Water Extraction 18:20
Sabatier Reactor / Electrolysis 21:40
Coolers / Cryocoolers 24:24
Earthworks 26:02
Conclusion 28:19

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Sources
Power Requirements
https://www.reddit.com/r/spacex/comme...
More details on requirements
https://github.com/spacex-reddit/anal...
https://www.reddit.com/r/SpaceXLounge...
Burning Methane
https://en.wikipedia.org/wiki/Stoichi...
Transfer calculation
https://transfercalculator.com/calcul...
Starship
https://www.quora.com/If-SpaceX-Stars...
Starship terminal velocity on Mars
https://www.reddit.com/r/SpaceXLounge...
Electrolysis stacks
http://hybalance.eu/wp-content/upload...
Starship reentry
https://www.reddit.com/r/SpaceXLounge...
Cost to go to Mars using starship
https://www.reddit.com/r/spacex/comme...

Powerpack pricing
https://electrek.co/2020/03/31/tesla-...