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Next-Gen Species

The first step to human colonization of the universe is fairly straightforward: we need to figure out how to get people to Mars and beyond.

But evolutionary biologist Scott Solomon isn’t terribly concerned with how humans plan to explore the universe. Instead, he’s focused his attention on what might happen to our species once we settle into our off-world homes. His surprising conclusion: future human colonists might not be humans at all.

“Eventually,” he recently told Business Insider, “people living in space could evolve to be different enough from people on Earth that we would consider them to be different species.”

Big Head Case

Solomon posits that living in space could lead to a number of evolutionary changes in the human race.

For one, the low-gravity environment of space decreases bone density, which could increase the risk of a mother fracturing her pelvis during natural childbirth.

That could make cesarean deliveries the norm for space explorers, which Solomon believes could “lead to larger heads in our descendants because they wouldn’t be constrained by the size of the birth canal.”

Skin Deep

Head size isn’t the only evolutionary change Solomon predicts for space-born generations of humans, either.

“[We may evolve] new types of skin pigments, like the melanin that protects our skin from ultraviolet sunlight on Earth,” he told BI. “That could mean that future generations living beyond Earth will evolve to have different skin colors.”

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