Posted on 03/20/2025 4:46:34 PM PDT by BenLurkin
While there are no scientific studies that link spaceflight to graying hair, NASA has previously suggested that spending time in space can cause “significant physiological changes.”
“Imagine if all of your physiological changes were hyper-accelerated so that you passed through life cycles in weeks as opposed to decades,” NASA wrote online when the agency announced it would be launching a “space-age” research program to study space’s effects on the human body.
“You’d be able to grow a beard overnight or your hair might begin graying in a matter of days or maybe menopause would come knocking by next weekend.”
NASA continued: “This may seem like a far stretch from reality, but spaceflight causes significant physiological changes including an accelerated loss of muscle and bone density, and immune system dysfunction that parallel the effects of natural aging here on Earth.”
In fact, a 2016 study “found that spaceflight alters human hair follicle gene expression,” reporting that, in some astronauts, the genes responsible for regulating hair growth were “upregulated,” meaning the genes could inhibit “cell proliferation” within the hair follicles.
While men appeared to disproportionately experience the phenomenon compared to women, the researchers suggested that, based on their findings, spaceflight could potentially result in hair loss.
Some observers at home have a simpler explanation for WIlliams’ silver tresses: a lack of hair dye aboard the ISS.
“A few have asked me why Sunita Williams has grey hair and looks ‘tired’ coming back home from space,” Emily Carney, a former US Navy nuclear technician and space historian, wrote on Threads.
“This is because in space there’s no hair dye or makeup mirror at your disposal.”
(Excerpt) Read more at duckduckgo.com ...
I’m guessing stress wondering if you ever get home...
A “Shocking Hair Color Shift”?
Only their Hairdresser knows for sure.
“star wars fish guy”
???
Something to do with relativity - as they move faster, they age faster.
She went from an Arby’s Junior to a Arby’s Super Deluxe king
Unlike Tang and the Canadian Arm device there was no commercial tie in. (Just kidding).
That’s impressive.
He looks like an alien.
Or was the hair gray before, but they weren’t able to dye their hair?
I don’t know much about butt plugs but I’ve always thought Mark “AR-15” Kelly looks like a radioactive mutant of some kind.
I think she dyed her hair.
What’s with the irrelevant links?
They didn't think to bring hair dye.
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