JD Vance has some valid questions about space colonies - The Hill

What the report says

The Hill published an opinion piece by space policy writer Mark R. Whittington arguing that Vice President JD Vance raised a legitimate scientific concern during a recent appearance on Joe Rogan’s podcast: whether humans can safely live, reproduce and develop in gravity conditions far weaker than Earth’s. Vance said he supports humans becoming a multiplanetary species and establishing a Mars colony, but questioned whether human biology, including DNA, functions properly away from Earth-like gravity.

Whittington wrote that Vance overstated the travel time to Mars, noting that a chemically powered mission could more likely involve about six months outbound, an 18-month wait for planetary alignment, and six months back. Still, the article said Vance’s broader worry reflects a real gap in knowledge. Decades aboard the International Space Station have shown that microgravity can contribute to bone loss, muscle weakening and fluid shifts, while research on DNA effects from microgravity and radiation remains unsettled.

The piece emphasized that less is known about partial gravity, such as Mars’s roughly 38 percent of Earth gravity or the moon’s one-sixth gravity. Whittington cited NASA-related research suggesting partial gravity may still harm the body in ways resembling microgravity, and noted that human reproduction on Mars could present major biological challenges.

The article concluded that Elon Musk’s long-term vision of a self-sustaining Mars settlement depends on biomedical research before permanent colonists are sent. Whittington suggested a future lunar base could help scientists study low-gravity health and reproduction, including through animal models, as part of preparing for eventual Mars habitation.