Well, as a member of-or a recent member of, the US military alone, then his DNA would be on file, as well as other physical info from 5 year physicals that are required for all military members
as a member of nasa, i am sure they have the dna of every astronaut for studies and for basic things like ID in the case of a fiery crash or some other event.
Also, as I said, this needs to be repeated with other sets of twins.
and, there are so many other flaws with our astronaut program (and maybe other nations as well?)
-age being the biggest one I see.
too many of our astronauts are just damned old. many go into space in their 40's and 50's (i believe Kelly was 52 when he went up). at those ages, there are already SO MANY changes occurring in a man's, and woman's body that affect hings like bone density and cell integrity
we need to make the astro program far more streamlined and open it up to far m ore ppl, being a military pilot should only be necessary for those who will fly the craft (yes i know they have had non military ppl, but not all that many compared to the military ones)
I know, from being bored one time on staff duty all night, while in the army, I once read the reg on applying for the army astronaut program. time in service requirements alone made it automatically the youngest you could be was in your 30's.
I think that a future space program, like going to mars, or setting up shop on the moon or a permanent orbiting platform, is going to require ppl with far more of a skill set then military pilot or the other limited fields they do recruit from.
also, i think ppl in their 20's would be a far better choice. they are at the peak of health having just completed their growth to full physical maturity. they are going to have more stamina and just plain old "oompf' then a 50 yr old
a 50 yr od may have better drive and motivation mentally, but they are lacking in the physical side NO MATTER how fit they are.
--other things as well. we do not do enough tests on human conditions in space
at some point we are going to have ppl staying permanently on the moon or in near earth orbit. we are eventually going to need to know zero/low g effects on things like reproduction as well as pregnancy and birth
what is the alt.? just send ppl out to the moon or elsewhere and have them just 'wing it' and hope for healthy offspring-their replacements or future colonists?
we also need to send sick ppl to space to study the effects of that. not seriously ill ppl, but ppl with flu and other virus (non death causing ones), we will need to study how bacterial infections work in humans in space and then how treatments like anti biotics (since many are made from living organisms) will function in space
we cant just assume things like this will work the same as on earth
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here is an interesting article written by Kelly himself. again ,one wonders if a person 30 yrs younger would have the same severe reactions in the same manner as he did?
https://www.smh.com.au/lifestyle/as...fects-of-a-year-in-space-20170922-gyn9iw.html