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Butch Wilmore and Suni Williams have returned to Earth after nine months aboard the International Space Station .
Williams appeared notably different with a long head of grey hair after landing on Tuesday .
Some online commenters joked that this could be due to a lack of hair dye on the ISS .
But scientists say microgravity interferes with hair growth in astronauts' hair follicles.
Microgravity leads to an increase in 'oxidative stress' in hair cells, which is a potential cause of greying.
Williams ' transformation was so profound that it sparked a bizarre conspiracy theory.
On social media, confused conspiracy theorists mixed up photos taken before and after the nine-month mission.
One confused commenter mistakenly claimed that Williams 's hair had actually darkened while in space.
The International Space Station is a $100 billion ( 80 billion ) science and engineering laboratory that orbits 250 miles above Earth .
VR Score
66
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