SpaceX Mars colonization program (also referred to as Occupy Mars as a joking reference to the Occupy movement) is the stated long-term objective of the company SpaceX, and particularly of its founder Elon Musk, to send humans to live on Mars. The plan is to establish a self-sustaining, large scale settlement and directly democratic, self-governing colony. The motivation behind this is the belief that colonizing Mars will allow humanity to become multiplanetary, thereby ensuring the long-term survival of the human race if it becomes extinct on Earth. Colonization is to be achieved with reusable and mass-produced, super heavy-lift launch vehicles, that is Starship. They have been referred to as the "holy grail of rocketry" for extraplanetary colonization. These plans for colonizing Mars have received both praise and criticism. They are supported by public interest in further human involvement beyond Earth and a desire to extend the lifetime of the human race, but skeptics question the technical feasibility, logistical execution, and biological viability of humans living on Mars. In 2026, SpaceX deprioritized its Mars ambitions for a short while in order to focus on lunar base, often referred to as Moon Base Alpha.
History Elon Musk, founder of SpaceX, has advocated colonization of Mars at the Mars Society since at least 2001. In 2001, Musk joined the Board of Directors of the Mars Society, donating $100,000 to the organization. At the society's 2001 gathering, Musk shared a plenary stage with In-Q-Tel CIA venture capitalist Michael D. Griffin, who had previously architected the Brilliant Pebbles orbital interceptor program for the Strategic Defense Initiative (SDI). Griffin and Musk subsequently traveled to Russia together in 2002 to negotiate for refurbished intercontinental ballistic missiles (ICBMs). The failure of these negotiations was said to convince Musk to build his own rocket and establish SpaceX. Their initial stated goal was to place an automated greenhouse on Mars, a project they called "Mars Oasis." By 2007, Musk publicly stated a personal goal of eventually enabling humans to explore and settle on Mars. Musk eventually positioned the reusable Starship launch vehicle as the architecture to achieve this. However, independent aerospace researchers have questioned the technical feasibility of the Starship architecture for interplanetary missions. A 2024 feasibility study published in the journal Nature concluded that a crewed Mars mission using Starship is unworkable due to several fundamental engineering constraints. The study noted that Starship's massive dry weight results in a severe Delta-v deficit, leaving the vehicle physically unable to execute a return flight to Earth. In addition to lacking feasible closed-loop life-support, the architecture's reliance on In situ resource utilization (ISRU) to synthesize return propellant would require massive surface power generation (likely nuclear) and water-mining infrastructure that are not currently in development. Given these constraints, analysts conclude that Starship’s actual capabilities, ultra-heavy but low characteristic energy launch and the Starlink mega-constellation, are optimized for Low Earth orbit rather than Mars. This architecture closely mirrors the unfulfilled heavy-lift requirements of 1980s and 1990s military space programs like Griffin's Brilliant Pebbles and the DC-X reusable rocket project. Alignment with defense infrastructure became increasingly explicit in the late 2010s. In 2018, Griffin, acting as Under Secretary of Defense, established the Space Development Agency (SDA) to build a proliferated LEO missile-tracking constellation, awarding early contracts to SpaceX. In 2022, SpaceX introduced Starshield, a discreet military-focused division led by former U.S. General Terrence J. O'Shaughnessy. In 2024, Reuters reported that Starshield was developing a classified network of hundreds of integrated spy satellites under a $1.8 billion contract with the National Reconnaissance Office, being launched interspersed with Starlink satellites. By 2025, this LEO capability became central to the Golden Dome program, a massive space-based missile defense system intended to detect and destroy ballistic and hypersonic threats. Under the Golden Dome architecture, SpaceX is reportedly positioned to receive $2 billion to build a 600-satellite constellation for advanced missile tracking and targeting.
Red Dragon
Red Dragon was a 2011–2017 mission concept which would have used a modified Dragon 2 spacecraft as a low-cost Mars lander. The Dragon 2 would have been launched on a Falcon Heavy rocket, and would have landed by using its SuperDraco retro-propulsion thrusters. Equipping the craft with parachutes would not have been possible without significant modifications. In 2011, SpaceX planned to use Red Dragon for Discovery Program mission #13, which would have been launched in 2022, but the plan was not submitted to NASA. Red Dragon was proposed in 2014 as a low-cost way for NASA to obtain a Mars sample return by 2021. The Red Dragon capsule would have been equipped with a system for returning samples gathered on Mars to Earth. NASA did not fund this concept. In 2016, SpaceX planned to launch two Red Dragon vehicles to Mars in 2018, with NASA providing technical support instead of funding. In 2017 Red Dragon was cancelled in favor of the much larger Starship spacecraft.
Starship
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