Biologist Scott Solomon said: "Science fiction has often portrayed Martians or aliens coming from Mars as being tall and lanky and thin."
He continued: "Perhaps in the face of this high radiation, we might evolve some new type of skin pigment to help us deal with that radiation.
"Maybe we get our own green men."
According to Dr. Solomon, the humans colonizing Mars would endure living conditions "so brutal" they prompt a change in skin color and result in a loss of eyesight.
He also predicts the children of Martian settlers would undergo drastic evolutionary changes, mutate and develop "brittle bones", "weaker muscles" and a "freakishly green coloring".
Mars, which is about half the size of Earth and has 38% less gravity, also lacks a global magnetic field, a thick atmosphere and an ozone layer to protect Musk's colonizers should they successfully make it to the distant planet.
Dr. Solomon, in his book Future Humans , claims the lack of a protective ozone layer would leave settlers battered by space radiation and UV light which, as a result, would lead to more mutations.
He also predicts humans living on the fourth planet from the sun would become more near-sighted because they would be forced to live in "small enclaves" and not need to see far.
Another pair of scientists, Eneko Axpe and Eric Appel, warned half of the astronauts traveling to Mars would likely develop Osteoporosis due to the "weightlessness" of space and the long 1,000-day trip.
Appel said: "A lot of people focus on the technological challenges of getting to Mars or the psychological challenges of being in a spacecraft for 1,000 days, but not necessarily the fact that your bones decay.
"Can people even make it, or will they be jello by the time they get there?"
As RadarOnline.com reported, Musk recently announced his plan to send an uncrewed spaceship to Mars in two years to make humanity a "multi-planet species".
The SpaceX founder also hopes to send a crewed spacecraft to the planet in four years before "building a self-sustaining city" on Mars "in about 20 years".
Musk, 53, tweeted on September 7: "The first Starships to Mars will launch in 2 years when the next Earth-Mars transfer window opens.
"These will be uncrewed to test the reliability of landing intact on Mars. If those landings go well, then the first crewed flights to Mars will be in 4 years."
He continued: "Flight rate will grow exponentially from there, with the goal of building a self-sustaining city in about 20 years.
"Being multiplanetary will vastly increase the probable lifespan of consciousness, as we will no longer have all our eggs, literally and metabolically, on one planet."
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