Nobel Laureate Michel Mayor Questions Elon Musk’s Plan to Build a Mars Colony

Nobel Prize-winning astronomer Michel Mayor has questioned Elon Musk's ambition to establish a self-sustaining civilization of one million people on Mars, arguing that the planet's harsh environment makes large-scale human settlement extremely difficult and that humanity should focus on protecting Earth.

Nobel Prize-winning astronomer Michel Mayor has questioned the feasibility of Elon Musk's plan to establish a large human settlement on Mars, citing the planet's hostile environment and the challenges of sustaining human life there.

“We do not have a Planet B. We have to take care of Earth,” Mayor told delegates at the Starmus science festival in Tenerife, Spain, in October 2026, according to a report by Benzinga.

Mayor challenged the feasibility of Musk's vision of making humanity a multiplanetary species, pointing to Mars' extremely thin atmosphere, freezing conditions, radiation exposure and unsuitable soil.

“Could one million persons migrate to Mars in the next century?” Mayor asked.

He noted that atmospheric pressure on Mars is roughly one-hundredth of Earth's and that its atmosphere is composed primarily of carbon dioxide, with argon and other gases but virtually no oxygen suitable for human breathing.

The planet's environment would require settlers to live in pressurized habitats or underground structures to protect themselves from extreme temperatures and radiation.

Its soil also contains substances such as perchlorates that pose challenges for agriculture and human health.

Mayor further questioned the idea that humanity could eventually move to a potentially habitable planet beyond the solar system.

He said that even a planet 30 light-years away would take millions of years to reach using spacecraft traveling at speeds comparable to those of the Apollo missions.

Mayor shared the 2019 Nobel Prize in Physics with Didier Queloz for their discovery of 51 Pegasi b in 1995, the first confirmed exoplanet orbiting a Sun-like star.

His comments contrast with Musk's long-standing ambition to establish a permanent human settlement on Mars and eventually build a self-sustaining civilization there.

SpaceX has pursued the development of its Starship spacecraft as part of its broader plans for interplanetary transportation.

NASA research supports many of Mayor's concerns about the Martian environment.

The planet has an atmosphere composed mostly of carbon dioxide, surface pressure below 1% of Earth's average and radiation levels estimated in research to be roughly 40 to 50 times those experienced on Earth.

Mayor's criticism does not establish that human settlement on Mars is impossible, but it highlights the substantial technological, environmental and logistical challenges that would have to be overcome.