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SpaceX Mars colonization program (colloquially also referred to as Occupy Mars) is a planned objective of the company SpaceX and particularly of its founder Elon Musk to colonize Mars. The main element of this ambition is the plan to establish a self-sustained large scale settlement and colony on Mars, claiming self-determination under direct democracy. The main motivation behind this is the belief that the colonization of Mars allows humanity to become multiplanetary and therefore secures the long-term survival of the human species in case of Earth being rid of human life.

Colonization is to be achieved via the development and use of reusable and mass-produced super heavy-lift launch vehicles called Starship. Starship has been referred to as the "holy grail of rocketry" for extraplanetary colonization.

These plans for colonization have garnered both praise and criticism, being supported as a result of public excitement for further human involvement beyond Earth and a desire to prefer human longevity, and being questioned for its existential perspective, execution, livability and legality.

History

Elon Musk, founder of SpaceX, has engaged in space advocacy relating to the colonization of Mars since at least 2001 at the Mars Society.

As early as 2007, Elon Musk publicly stated a personal goal of eventually enabling human exploration and settlement of Mars.

Subsequently, SpaceX has stated its goal is to colonize Mars to ensure the long-term survival of the human species, proposing since the 2000s and early 2010s different concepts for reaching Mars, including space tugs.

Red Dragon

Red Dragon was a 2011–2017 concept mission which would have used a modified Dragon 2 spacecraft as a low-cost Mars lander. If flown, it would have been launched on a Falcon Heavy, and land solely via the use of its SuperDraco retro-propulsion thrusters, as parachutes would have required significant vehicle modifications.

In 2011, SpaceX planned on proposing Red Dragon for the Discovery Mission #13, which would launch in 2022, but it was not submitted. It was then proposed in 2014 as a low-cost way for NASA to achieve a Mars sample return by 2021. In the concept, the Red Dragon capsule would be equipped with the system needed to return samples gathered on Mars. NASA did not fund this concept.

In 2016, SpaceX planned on launching two Red Dragon vehicles in 2018, with NASA providing technical support instead of funding. However, in 2017, Red Dragon was cancelled, in favor of the much larger Starship spacecraft.

Starship

The company's current plan was first formally proposed at the 2016 International Astronautical Congress alongside a fully-reusable launch vehicle, the Interplanetary Transport System. Since then, the launch vehicle was renamed to "Starship", and has been in development since.

The development program reached multiple milestones in 2024 such as on its third test flight, it reached its desired trajectory for the first time and on its fourth flight test, both stages of the vehicle achieved controlled splashdown after launch for the first time.

On 7 September 2024, SpaceX announced that it would launch the first uncrewed Starship missions to Mars in two years, aligning with the next Earth-Mars transfer window. Elon Musk shared on the social media platform X that these missions would focus on testing the reliability of landing Starships intact on Mars. SpaceX plans to launch five uncrewed Starships to Mars during that transfer window. If successful, the company plans to begin crewed flights to Mars in about four years.

Composition

Goals

As early as 2007, Elon Musk stated a personal goal of eventually enabling human exploration and settlement of Mars.

SpaceX has stated its goal is to colonize Mars to ensure the long-term survival of the human species by becoming multiplanetary.

Launch system

SpaceX has been setting up since 2014 a facility called Starbase and more recently a factory called Starfactory on the previously populated and wildlife area Boca Chica (Texas) peninsula in the Rio Grande delta at the Gulf of Mexico, partly justified by SpaceX with its colonial perspective, to launch and build an in development fully reusable super heavy-lift launch vehicle with the name Starship. Aiming with its reusability to drastically reduce launch costs and scaled construction and swift maintenance between flights, this has been the basis for SpaceX to advance its Mars ambitions and when operational will allow it to provide the necessary transportation capabilities for its colonial goals. The reusability and its resulting reduced launch costs is expected to expand space access to more payloads and entities.

Musk has stated that a Starship orbital launch could eventually cost $2 million, starting at $10 million within 2–3 years and dropping with time. Starfactory is at the same time planned to produce at peak one Starship per day.

The rocket consists of a Super Heavy first stage booster and a Starship second stage spacecraft, powered by Raptor and Raptor Vacuum engines. Both stages are made from stainless steel.

Methane was chosen for the Raptor engines because it is relatively inexpensive, produces a low amount of soot as compared to other hydrocarbons, and can be created on Mars from carbon dioxide from the atmosphere and hydrogen via the Sabatier reaction. The engine family uses a new alloy for the main combustion chamber, allowing it to contain 300 bar (4,400 psi) of pressure, the highest of all current engines. In the future, it may be mass-produced and cost about $230,000 per engine or $100 per kilonewton.

First missions

Musk has made statements on several occasions about aspirational dates for Starship's earliest possible Mars landing, including in 2022, that a crewed mission to Mars could take place no earlier than 2029.

SpaceX's early missions to Mars are to involve small fleets of Starship spacecraft, funded by public–private partnerships.

SpaceX has stated on several occasions aspirational plans to build a crewed base on Mars for an extended surface presence, which it hopes will grow into a self-sufficient colony.

Before any people are transported to Mars, a number of cargo missions would be undertaken first in order to transport the requisite equipment, habitats and supplies. Equipment that would accompany the early groups would include "machines to produce fertilizer, methane and oxygen from Mars' atmospheric nitrogen and carbon dioxide and the planet's subsurface water ice" as well as construction materials to build transparent domes for crop growth. As of September 2024, SpaceX plans to launch five uncrewed Starships to Mars during the next available Earth-Mars transfer window in 2026.

Musk plans for the first crewed Mars missions to have approximately 12 people, with goals to "build out and troubleshoot the propellant plant and Mars Base Alpha power system" and establish a "rudimentary base." The company plans to process resources on Mars into fuel for return journeys, and use similar technologies on Earth to create carbon-neutral propellant.

Populating

The company hopes that once infrastructure is established on Mars and launch cost is reduced, populating can begin.

After the first few windows of crewed Mars landings, Musk has suggested that the number of people who are sent to Mars could be ramped up rapidly.

A successful colonization, meaning an established human presence on Mars growing over many decades, would ultimately involve many more economic actors than SpaceX.

For reference, Musk's timeline for the colonization of Mars involves a crewed mission as early as 2029 and the development of a self-sustaining colony by 2050.

Musk has stated in 2024 that in-situ resource utilization will be critical for establishing a self-sustaining colony, and that SpaceX plans to begin its efforts in advancing that field in "seven to nine years". Current theories for in-situ resource utilization involve harvesting CO2 from the atmosphere and splitting into its raw components. This will involve using the O2 as well as CH4 for fuel production, and specifically the O2 in addition to Nitrogen (the second-most common gas in the Martian atmosphere) for breathing air within habitats.

The program aims to send a million people to Mars, using a thousand Starships sent during a Mars launch window, which occurs approximately every 26 months. Proposed journeys would require 80 to 150 days of transit time, averaging approximately 115 days (for the nine synodic periods occurring between 2024 and 2041).

Reception and feasibility

Mars colonization has gained increased interest, both supportive and critical, since the technical achievements of SpaceX's and Elon Musk's rise of popularity in the 2010s, and more so into the 2020s.

Support

Some experts, like Robert Zubrin, support the concept due to the prevalence of water ice in the form of permafrost and glaciers on Mars, as well as other resources like carbon dioxide and nitrogen. According to Zubrin, Starship's planned lower launch cost could make space research profitable, allowing major advancements in medicine, computers, material science, making mining profitable as well and space-based economy and colonization practical.

Others like Saul Zimet have expressed strong support for the concept, suggesting the possibility that the technological advancements that could be developed on Mars will come to benefit the whole of Earth.

Criticism

SpaceX's plan and colonization of Mars in general, has been criticized ethically and technically.

It has been argued that settling Mars may divert attention from solving problems on Earth that may also become problems on Mars, with the reasoning that plans about Mars are always about the plans we have for Earth. Jeff Bezos, founder of Blue Origin, SpaceX's competitor in commercial spaceflight, has rejected Mars colonization as a mere "Plan B", suggesting instead to preserve Earth through space development and moving all heavy industrial activity to space. SpaceX's perspective has also been criticised as perpetuating the idea of colonialism. Zahaan Barhmal of The Guardian writes that the impact of human settlement on Mars, with regards to planetary protection, has not been comprehensively answered.

It has been argued that there are physical and social consequences that need to be addressed with regards to long-term survival on the surface of Mars. Former U.S. President Barack Obama has characterized Mars as more inhospitable than Earth would be "even after a nuclear war", with others pointing out that Earth and underground shelters on Earth could still provide better conditions and protection for more people from apocalyptic scenarios. Mars colonization has been called a 'dangerous delusion' by Lord Martin Rees, a British cosmologist/astrophysicist and the Astronomer Royal of the United Kingdom. Musk has stated that staying on Mars is a life threatening endeavor that needs to be glorious to be worth it. Exploration of Mars has also been argued to be better left to the already successful robotic missions, with crewed missions simply being too expensive, dangerous and boring.

Regarding the execution of SpaceX's Mars program, the plans have been criticized as far-fetched because of uncertainties in its financing and because it primarily addresses transportation to Mars and not the steps that follow. As of July 2019, SpaceX had not publicly detailed plans for the spacecraft's life-support systems, radiation protection, and in situ resource utilization, which are essential for space colonization. George Dvorsky writing for Gizmodo characterized Musk's timeline for Martian colonization as "stupendously unreasonable" and "pure delusion".

Law

SpaceX intends to base the colony governing laws on self-determination, and direct democracy (instead of representative democracy). Some of this has been introduced through the terms and services agreement for individual users of SpaceX's Starlink platform, stating the following: "the parties recognize Mars as a free planet and that no Earth-based government has authority or sovereignty over Martian activities".

In contrast to such claims, international space law, proclaiming space being "province of all mankind", holds that Mars is not free to be claimed, its legal status sharing some elements of the legal status of international waters. Furthermore, the realization of direct-democracy by technocratic colonizers and the legal accommodation of a diverse population is thought to be challenging.

Trivia

It has been pointed out that, coincidentally, rocket engineer Wernher von Braun envisioned colonies on Mars led by a publicly elected leader titled the "Elon" in his book, Project Mars: A Technical Tale.

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v t e SpaceX
History
Launch vehicles	Current Falcon 9 Block 5 boosters Falcon Heavy In development Starship Super Heavy booster upper stage lunar lander Retired Falcon 1 Falcon 9 v1.0 v1.1 "Full Thrust" v1.2 Block 4 Cancelled Falcon 1e* Falcon 5* Falcon 9 Air* BFR and ITS*
Spacecraft	Cargo Dragon 1 Cargo Dragon 2 Cargo Dragon XL* Starship* Crewed Dragon 2 Crew C206 Endeavour C207 Resilience C210 Endurance C212 Freedom Starship*
Test vehicles	Current Starship prototypes first stage booster upper stage Retired Grasshopper F9R Dev1† DragonFly Starhopper Unflown F9R Dev2*
Rocket engines	Merlin 1A 1B* 1C 1D Vacuum Kestrel Draco SuperDraco Raptor 1 2 3 Vacuum
Lists of missions	Falcon 1 Falcon 9 and Falcon Heavy 2010–2019 2020–2021 SpaceBEE Starlink launches in the Russo-Ukrainian War Starship
Launch facilities	Orbital CCSFS SLC-40 KSC LC-39A VSFB SLC-4E VSFB SLC-6* Omelek Island† Atmospheric McGregor New Mexico† Starbase Boca Chica
Landing sites	Autonomous spaceport drone ships Landing Zones LZ-1 and LZ-2 LZ-4
Other facilities	Headquarters and factory Hawthorne, California Rocket development and test facility McGregor, Texas Satellite development facility Redmond, Washington Regional offices Chantilly, Houston, Seattle, Washington DC STARGATE
Support	Megan (recovery ship) Shannon (recovery ship) SpaceX fairing recovery program
Contracts	Commercial Orbital Transportation Services Commercial Resupply Services Commercial Crew Program Commercial Lunar Payload Services Gateway Logistics Services Human Landing System Polaris Rocket Cargo Starshield
R&D programs	Reusability Falcon 9 landing tests Red Dragon (canceled) Mars transport
Key people	Elon Musk (CEO, CTO) Gwynne Shotwell (President and COO) Tom Mueller (former VP of Propulsion Development)
Related	Blue Origin Federation, LLC v. United States Commercial astronaut Billionaire space race Countdown: Inspiration4 Mission to Space (2021 docuseries) Return to Space (2022)
* denotes unflown vehicles or engines, and future missions or sites. † denotes failed missions, destroyed vehicles, and abandoned sites. Category

v t e Human mission to Mars
List of crewed Mars mission plans
21st-century proposals	Active Mars Base Camp SpaceX Mars program Passive Austere Human Missions to Mars Mars Piloted Orbital Station Mars to Stay Former Aurora programme Constellation program Mars One Inspiration Mars Vision for Space Exploration
20th-century proposals	The Mars Project Martian Piloted Complex Aelita TMK Ride Report Space Exploration Initiative Mars Direct The Case for Mars Mars Design Reference Mission 3.0
Mars analogs (list)	MARS-500 Mars Analogue Research Station Program FMARS MDRS Arctic Mars Analog Svalbard Expedition Concordia Station HI-SEAS NEEMO
Advocacy	Caves of Mars Project Mars Institute Mars Society
Hardware concepts	Mars habitat Crewed Mars rover Mars suit Mars Excursion Module Mars lander Mars rover
Miscellany	Colonization of Mars Exploration of Mars Fiction films novels Mars cycler Mars orbit rendezvous Terraforming of Mars Mars atmospheric entry Mars flyby

v t e Space tourism
Organizations	Active Axiom Space Bigelow Aerospace Blue Origin Airbus D&S Mojave Aerospace Ventures Orbital Technologies PDAS Redwire Sierra Nevada Corporation Space Adventures SpaceX The Spaceship Company Virgin Galactic CAS Space ARCA Association of Autonomous Astronauts Astronaute Club Européen Commercial Spaceflight Federation Copenhagen Suborbitals Space Frontier Foundation Space Tourism Society Defunct Armadillo Aerospace Canadian Arrow Golden Spike Company MirCorp Orion Span PlanetSpace RocketShip Tours Space Island Group (Space Island Project) XCOR Aerospace
Vehicles	Current Soyuz Dragon 2 New Shepard SpaceShipTwo Future New Glenn SpaceShip III Starliner Starship
Living in space	Commercialization of space Space colonization Space medicine Space settlement Space station Suborbital spaceplane
Space competitions	America's Space Prize Ansari X Prize Google Lunar X Prize Space elevator competitions
Space tourists	Past Dennis Tito Mark Shuttleworth Gregory Olsen Anousheh Ansari Charles Simonyi Richard Garriott Guy Laliberté Oliver Daemen Jared Isaacman Sian Proctor Hayley Arceneaux Christopher Sembroski Yusaku Maezawa Yozo Hirano Larry Connor Mark Pathy Eytan Stibbe John Shoffner
Space tourism missions	Past Inspiration4 Blue Origin NS-16 Blue Origin NS-18 Blue Origin NS-19 Blue Origin NS-20 Blue Origin NS-21 Blue Origin NS-22 Galactic 02 Galactic 03 Galactic 04 Galactic 05 Galactic 06 Axiom-1 Axiom-2 Polaris Dawn Cancelled dearMoon
Related	Axiom Station Tourism on the Moon Tourism on Mars Haven-1

v t e Proposed spacecraft missions to the Solar System
Discovery and exploration of the Solar System Timeline of Solar System exploration
Sun	Proposals ADAHELI Lagrange Sundiver Cancelled Pioneer H OSO J Solar Sentinels
Mercury and Venus	Proposals CUVE DAVINCI EnVision HAVOC Shukrayaan-1 VAMP Venera-D VERITAS VICI VISAGE VISE VOX Zephyr Cancelled EVE Mercury Observer TMK-Mavr Venus Orbiting Imaging Radar Vesta
Mars	Proposals BOLD SpaceX Mars transportation infrastructure DePhine Icebreaker Life Mars Geyser Hopper Mars-Grunt Mars Micro Orbiter‎ Mars One MELOS rover MetNet NeMO PADME Phootprint Sky-Sailor Cancelled ARES Astrobiology Field Laboratory Beagle 3 Mars 4NM & 5NM Mars 5M (Mars-79) Mars-Aster MAX-C Mars Surveyor Lander Mars Telecommunications Orbiter NetLander Northern Light Red Dragon SCIM Vesta Voyager Mars
Jupiter	Proposals Europa Lander FIRE Io Volcano Observer Laplace-P OKEANOS SMARA Cancelled Argo EJSM-Laplace Europa Orbiter Innovative Interstellar Explorer Jovian Europa Orbiter Jupiter Icy Moons Orbiter Neptune Orbiter New Horizons 2 Pioneer H Tsiolkovsky mission
Saturn	Proposals AVIATR Dragonfly ET ELF EnEx JET Kronos LIFE Oceanus Saturn Atmospheric Entry Probe SPRITE TALISE TiME Cancelled Argo Titan Saturn System Mission
Uranus and Neptune	Proposals MUSE NASA Uranus orbiter and probe Oceanus ODINUS Triton Hopper Uranus Pathfinder Interstellar Express Cancelled Argo Mariner Mark II Neptune Orbiter New Horizons 2
Minor planets and comets	Proposals CAESAR HAMMER OKEANOS Cancelled AGORA AIM ARM/ARU Castalia Comet Hopper CONDOR CORSAIR CRAF Don Quijote Hayabusa Mk2 MAOSEP Marco Polo New Horizons 2 Pluto Kuiper Express Vesta
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