What is the Physics Behind Colonizing Mars and Einstein's Elevator?

Bombu
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How did you find PF?
Via Google search about some physics issue or the other.
I just discovered this forum searching for some entertaining science issue - I don't remember what. Then I got sucked into a rabbit hole of reading pages and pages of a old discussion of colonizing Mars. Very interesting (I'll pass, thanks). Then I read about Einstein's elevator. I was gratified to see that here nobody's confused by the simple fact that there would be multiple ways to determine if you were being accelerated or pulled by gravity (my sister, the PhD, sees me as a crazy vain fool who thinks he knows more than Einstein, but I'm not and I don't).

I recently graduated from high school (in my 60s, yes 60s) but I have a couple of AA degrees and I was privileged to teach electronics classes at my community college for several years.

I'm looking forward to asking physics questions here. Thanks for the opportunity.
 
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Thank you.
 
I am retired with a scientific background in Mathematics and Physics though I quit Academia after graduation. Recently, my interest has revived and I have started to review what I knew before and learn new stuff. My interests are in Physics and Mathematical Physics. I hope I can find answers to some of my questions here and perhaps in the future, I can also answers some questions. How have I arrived here? During the past two months, I have been doing some online research to find the best...

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