Blast off! What a thrill it is to see and explore new worlds. Trading Earth’s environment for the environment of space is exciting. But, an “Earth-normal” environment is very different from a “space-normal” world. As the environment changes, so will an astronaut’s body change.
Less gravity is one of the major changes of living in space. Traveling to Mars and, perhaps into deep space, will involve living in space for months or years. How will an astronaut’s body change and adapt as a result of living in a reduced gravity environment for that long?