QUESTION: If and when humankind colonize the Red Planet, will the colonists' children undergo an evolutionary change due to the low gravity and other factors of the Martian environment? What might these evolutionary changes be like? ANSWER from Steve Wall on July 1, 1998: It's a very interesting question. I'm no expert on evolution, but I certainly would expect that evolution would begin to adapt to that and many other changes in environment. Remember, though, that evolution is a very slow process, and I would guess that recognizable changes would not occur for thousands of years at the earliest.