User:Chessrat/SpaceX Mars colonization infrastructure plans

SpaceX intends to create a privately-funded infrastructure system to enable the human colonization of Mars. Aspects of this system include reusable launch vehicles and spacecraft; Earth infrastructure for rapid launch and relaunch; low Earth orbit, zero-gravity propellant transfer technology.

Development work began in earnest before 2012 when SpaceX began design work for the large Raptor rocket engine which will be used on all versions of the BFR launch vehicle and spacecraft (and was previously planned to be used all versions of the ITS launch vehicle and spacecraft). New rocket engine designs are typically considered one of the longest of the development subprocesses for new launch vehicles and spacecraft. By June 2016, the company publicly announced conceptual plans that included the first Mars-bound cargo flight of the new rockets launching no earlier than 2022, followed by the first Mars flight with passengers one synodic period later in 2024.

In July 2017, SpaceX announced updated plans to build a fully-reusable launch vehicle and spacecraft; this design is smaller than the previous design proposed in 2016. and unveiled the new design in September: a 9 m-diameter rocket that would be known by the codename BFR. The BFR launch vehicle will have the capacity to put 150 tonnes of payload onto a Mars trajectory rather than the 550 tonne capacity of the 12 m-diameter ITS launch vehicle design SpaceX had announced in 2016. With the BFR, SpaceX is aiming to put the first humans on Mars by 2024.

SpaceX intends to concentrate its resources on the transportation part of the project, including a propellant plant that could be deployed on Mars to make methalox rocket propellant from local resources. However, Musk is championing a much larger set of long-term Mars settlement objectives, ones that go far beyond what SpaceX projected to build and those other objectives would ultimately involve many more economic actors—whether individual, company, or government—to facilitate the settlement to build out over many decades.

History
As early as 2007, Elon Musk, the founder of SpaceX, stated a personal goal of eventually enabling human exploration and settlement of Mars, although his personal public interest in Mars goes back at least to 2001. Bits of additional information about the mission architecture were released in 2011–2015, including a 2014 statement that initial colonists would arrive at Mars no earlier than the middle of the 2020s. Company plans as of mid-2016 continued to call for the arrival of the first humans on Mars no earlier than 2025.

Musk stated in a 2011 interview that he hoped to send humans to Mars's surface within 10–20 years, and in late 2012 he stated that he envisioned a Mars colony of tens of thousands with the first colonists arriving no earlier than the middle of the 2020s.

In October 2012, Musk articulated a high-level plan to build a second reusable rocket system with capabilities substantially beyond the Falcon 9/Falcon Heavy launch vehicles on which SpaceX had by then spent several billion US dollars. This new vehicle was to be "an evolution of SpaceX's Falcon 9 booster ... much bigger [than Falcon 9]." But Musk indicated that SpaceX would not be speaking publicly about it until 2013. In June 2013, Musk stated that he intended to hold off any potential IPO of SpaceX shares on the stock market until after the "Mars Colonial Transporter is flying regularly."

In August 2014, media sources speculated that the initial flight test of the Raptor-driven super-heavy launch vehicle could occur as early as 2020, in order to fully test the engines under orbital spaceflight conditions; however, any colonization effort was reported to continue to be "deep into the future".

In January 2015, Musk said that he hoped to release details in late 2015 of the "completely new architecture" for the system that would enable the colonization of Mars. but those plans changed and, by December 2015, the plan to publicly release additional specifics had moved to 2016. In January 2016, Musk indicated that he hoped to describe the architecture for the Mars missions with the next generation SpaceX rocket and spacecraft later in 2016, at the 67th International Astronautical Congress conference, in September 2016. Musk stated in June 2016 that the first unmanned MCT Mars flight was planned for departure in 2022, to be followed by the first manned MCT Mars flight departing in 2024. By mid-September 2016, Musk noted that the MCT name would not continue, as the system would be able to "go well beyond Mars", and that a new name would be needed. This became the Interplanetary Transport System (ITS), a name that would, in the event, last for just one year.

On 27 September 2016, at the 67th annual meeting of the International Astronautical Congress, Musk unveiled substantial details of the design for the transport vehicles—including size, construction material, number and type of engines, thrust, cargo and passenger payload capabilities, on-orbit propellant-tanker refills, representative transit times, etc.—as well as a few details of portions of the Mars-side and Earth-side infrastructure that SpaceX intends to build to support the flight vehicles. In addition, Musk championed a larger systemic vision, a vision for a bottom-up emergent order of other interested parties—whether companies, individuals, or governments—to utilize the new and radically lower-cost transport infrastructure to build up a sustainable human civilization on Mars, potentially, on numerous other locations around the Solar System, by innovating and meeting the demand that such a growing venture would occasion. In the 2016 iteration, the system technology was specifically envisioned to eventually support exploration missions to other locations in the Solar System including the moons of Jupiter and Saturn.

In July 2017, SpaceX made public plans to build a much smaller launch vehicle and spacecraft prior to building the ITS. The new system architecture has "evolved quite a bit" since the November 2016 articulation of the very large Interplanetary Transport System. A key driver of the new architecture is to make the new system useful for substantial Earth-orbit and Cislunar launches so that the new system might pay for itself, in part, through economic spaceflight activities in the near-Earth space zone.

The launch vehicle was initially mentioned in public discussions by Elon Musk in 2012 as part of SpaceX description of its overall Mars system architecture, then known as the Mars Colonial Transporter (MCT). MCT was SpaceX's name for its privately funded development project to design and build a spaceflight system of reusable rocket engines, launch vehicles and space capsules to eventually transport humans to Mars and return them to Earth.

As early as 2007 however, Musk had stated a personal goal of eventually enabling human exploration and settlement of Mars. Bits of additional information about the mission architecture were released in 2011–2015, including a 2014 statement that initial colonists would arrive at Mars no earlier than the middle of the 2020s, and SpaceX began development of the large Raptor rocket engine for the Mars Colonial Transporter before 2014.

Musk stated in a 2011 interview that he hoped to send humans to Mars' surface within 10–20 years, and in late 2012 that he envisioned the first colonists arriving no earlier than the middle of the 2020s.

In October 2012, Musk first publicly articulated a high-level plan to build a second reusable rocket system with capabilities substantially beyond the Falcon 9/Falcon Heavy launch vehicles on which SpaceX had by then spent several billion US dollars. This new vehicle was to be "an evolution of SpaceX's Falcon 9 booster ... much bigger [than Falcon 9]." But Musk indicated that SpaceX would not be speaking publicly about it until 2013. In June 2013, Musk stated that he intended to hold off any potential IPO of SpaceX shares on the stock market until after the "Mars Colonial Transporter is flying regularly."

In February 2014, the principal payload for the MCT launch vehicle was announced to be a large interplanetary spacecraft named Mars Colonial Transporter, capable of carrying up to 100 tonne of passengers and cargo. Musk stated that Mars Colonial Transporter will be "100 times the size of an SUV". According to SpaceX engine development head Tom Mueller, concept designs at the time indicated SpaceX could use nine Raptor engines on a single rocket, similar to the use of nine Merlin engines on each Falcon 9 booster core, in order "to put over 100 tons of cargo on Mars." At that time, it appeared that the large rocket core that would be used for the booster to be used with MCT would be at least 10 m in diameter—nearly three times the diameter and over seven times the cross-sectional area of the Falcon 9 booster cores—and was expected to have up to three rocket cores with a total of at least 27 engines.

By August 2014, media sources speculated that the initial flight test of the Raptor-driven super-heavy launch vehicle could occur as early as 2020, in order to fully test the engines under orbital spaceflight conditions; however, any colonization effort was then reported to continue to be "deep into the future". Previously, the launch vehicle was known informally as the BFR ("Big Falcon Rocket or Big Fucking Rocket"), a name coined by Musk personally in reference to the BFG 9000 from the 1993 video game Doom. The spacecraft had a similar moniker: informally dubbed the BFS (for Big Fucking Spaceship), also coined by Musk. SpaceX indicated in 2014 that there may be more than one design in a family of SpaceX super-heavy lift launch vehicles. In January 2015, Musk said that he hoped to release details of the "completely new architecture" for the Mars transport system in late 2015 but those plans changed and, by the end of the year, the plan to publicly release additional specifics had moved to 2016. Musk stated in June 2016 that the first unmanned MCT Mars flight could happen as early as for 2022, to be followed by the first manned MCT Mars flight departing as early as 2024. Company plans as of mid-2016 continued to call for the arrival of the first humans on Mars no earlier than 2025. As of 25 August 2016, the rocket had not yet been given a formal name by SpaceX, although Musk commented on a proposal on Twitter to name it "Millennium". In his September 2016 announcement, Musk referred to the vehicle components as the "interplanetary booster", the "interplanetary spaceship", and the "tanker". In mid-September 2016, Musk noted that the Mars Colonial Transporter name would not continue, as the system would be able to "go well beyond Mars", and that a new name would be needed. The name selected was Interplanetary Transport System (ITS)

SpaceX CEO Musk unveiled details of the space mission architecture, launch vehicle, spacecraft, and Raptor engines that power the vehicles at the 67th International Astronautical Congress on September 27, 2016. The first firing of a Raptor engine occurred on a test stand in September 2016 as well.

In October 2016, Musk indicated that the initial prepreg carbon-fiber tank test article, built with no sealing liner, had performed well in initial cryogenic fluid testing, and that a pressure test of the tank at approximately 2/3 of the design burst pressure was slated for later in 2016, with the very large tank placed on an ocean barge for the test. This test was successfully completed in November 2016.

In July 2017, SpaceX made public plans to build a much smaller launch vehicle and spacecraft prior to building the ITS. The new system architecture has "evolved quite a bit" since the November 2016 articulation of the very large Interplanetary Transport System. A key driver of the new architecture is to make the new system useful for substantial Earth-orbit and cislunar launches so that the new system might pay for itself, in part, through commercial spaceflight activities in the near-Earth space zone.

Description
SpaceX Mars objectives, and the specific mission architectures and launch vehicle designs that might be able to participate in parts of that architecture, have varied over the years, and only partial information has been publically released. However, once the architecture was unveiled in late 2016, all launch vehicles, spacecraft, and ground infrastructure have shared several basic elements.

Overview and major elements
The SpaceX Mars architecture, first detailed publically in 2016, consists of a combination of several elements that are key—according to Musk—to making long-duration beyond Earth orbit (BEO) spaceflights possible by reducing the cost per ton delivered to Mars:
 * a new fully reusable super heavy-lift launch vehicle that consists of a reusable booster stage and a reusable integrated second-stage-with-spacecraft that comes in two versions: a large, long-duration, beyond-Earth-orbit spacecraft capable of carrying passengers, bulk cargo, or propellant cargo, to other Solar System destinations.   The combination of a second-stage of a launch vehicle with a long-duration spacecraft is unusual for any space mission architecture, and has not been seen in previous spaceflight technology.
 * refilling of propellants in orbit, specifically to enable the long-journey spacecraft to expend most all of its propellant load during the launch to low Earth orbit while it serves as the second stage of the launch vehicle, and then—after refilling on orbit—provide the significant amount of energy necessary to put the spacecraft onto an interplanetary trajectory.
 * propellant production on the surface of Mars: to enable the return trip back to Earth and support reuse of the spacecraft, enabling significantly lower cost to transport cargo and passengers to distant destinations. Once again, the large propellant tanks in the integrated space vehicle are filled remotely.
 * selection of the right propellant: Methane (CH4)/oxygen (O2)—also known as "deep cryo methalox" —was selected as it was considered better than other common space vehicle propellants like Kerolox or Hydrolox principally due to ease of production on Mars and the lower cost of the propellants on Earth when evaluated from an overall system optimization perspective. Methalox was considered equivalent to one of the other primary options in terms of vehicle reusability, on-orbit propellant transfer, and appropriateness for super-heavy vehicles.

Rocket technology development
SpaceX has articulated that a completely new, fully-reusable, super heavy-lift launch vehicle is needed, and is developing designs that consist of a reusable booster stage and a reusable integrated second-stage/long-duration-spacecraft. They have developed more than one comprehensive set of booster and spacecraft designs that they believe would best achieve their Mars vision.

The current vehicle designs, unveiled in September 2017, include a four vehicles that each use what Musk called the internal codename "BFR": the BFR booster, BFR spaceship, BFR tanker, and the BFR satellite delivery spacecraft.

Super-heavy lift launch vehicle
The design released in September 2017 for the super-heavy lift launch vehicle BFR was sized to place up to 150 tonne (reusable-mode) or 250 tonne (expendable-mode)—or carry 150 tonne of propellant on a tanker—to low Earth orbit (LEO). The 2016 design for the Interplanetary Transport System was sized to place up to 300 tonne (reusable-mode) or 550 tonne (expendable-mode)—or carry 150 tonne of propellant on an ITS tanker—to LEO. All parts of the SpaceX rocket architecture for Mars will be powered by the Raptor bipropellant liquid rocket engines on both stages, using exclusively densified liquid methane fuel and liquid oxygen oxidizer on both stages. The tanks will be autogenously pressurized, eliminating the need for the problematic helium gas pressurization.

All parts of the launch vehicle design are fully reusable, making use of the SpaceX reusable technology that was developed during 2011–2016 for Falcon 9 and Falcon Heavy.

On all Earth-away launches, the long-duration spacecraft (whether tanker, cargo ship, or spaceship) is planned to also play a role briefly as the second stage of the launch vehicle to provide acceleration to orbital velocity, a design approach not used in other launch vehicles.

Passenger spaceship
The passenger spacecraft is an interplanetary-capable ship with a carbon-fiber primary structure propelled by Raptor engines operating on densified methane/oxygen propellants.

, the current design is known as the BFR spaceship and is powered by six Raptor engines.

The 2016 design—termed the Interplanetary Spaceship—was 49.5 m-long, had a maximum hull diameter of 12 m, with a 17 m-diameter at its widest point, was powered by nine Raptor engines, and was projected to be capable of transporting up to 450 tonne of cargo and passengers per trip to Mars, with on-orbit propellant refill before the beyond-Earth-orbit part of the journey.

Early flights to Mars are expected to carry mostly equipment and few people.

The transport capacity of the 2016 spaceship from low Earth orbit to a Mars trajectory—with a trans-Mars trajectory insertion energy gain of 6 km/s and full propellant tanks—was projected to be 450 tonne to Mars orbit, or 300 tonne landed on the surface with retropropulsive landing. SpaceX estimated Earth-Mars transit times to vary between 80–150 days, depending on particular planetary alignments during the nine discrete 2020–2037 mission opportunities, assuming 6 km/s delta-v added at trans-Mars injection.

The spaceship is designed to enter the Martian atmosphere at entry velocities in excess of 8.5 km/s and allow aerodynamic forces to provide the major part of the deceleration before the three center Raptor engines perform the final landing burn. The heat shield material protecting the ship on descent is PICA 3.0, and is reusable. Entry g-forces at Mars are expected to be in order of 4–6 g during the descent. The spaceship design g-load would be in the range of 5 g nominal, but able to withstand peak loads 2 to 3 times higher without breaking up.

Energy for the spaceship during the journey to Mars is projected to be produced by two large solar panel arrays, generating in the 2016 design approximately 200 kW of power while at the distance of Earth from the Sun, and less as the journey progresses and the Sun is farther away as the ship nears Mars.

On Mars journeys, the spaceship may use a large internal water layer to help shield occupants from space radiation, and may have a cabin oxygen content that is up to two times that which is found in Earth's atmosphere. The initial tests of the spaceship are not expected prior to 2020, with the booster to follow only later.

According to Musk, once landed, the spaceship would effectively become the first human habitat on Mars.

Tanker and Cargo spacecraft
A key feature of the overall launch system is a propellant-cargo-only tanker or cargo spacecraft: the BFR tanker or BFR satellite delivery spacecraft. Just as for the spaceship, the tanker or cargo spacecraft serve as the upper stage of the ITS launch vehicle during the launch from Earth.

The vehicle design for the tanker is exclusively for the launch and short-term holding of propellants to be transported to low Earth orbit for re-filling propellants in the spacecraft/ships. Once on orbit, a rendezvous operation will be effected with any ship that will be transiting on to a beyond Earth-orbit (BEO) destination, plumbing connections are made, and liquid methane and liquid oxygen propellants are transferred to the spaceship. To fully fuel a BEO ship for a long-duration flight, it is expected that several tankers would be required to launch from Earth, carrying and transferring the propellant to fully load for the longer and high-energy journey.

Following completion of the on-orbit propellant offloading, the concept of operations called for the reusable tanker to reenter Earth's atmosphere, land, and be prepared for another tanker flight.

The tankers and cargo ships are planned to be the same physical dimensions as the passenger spaceship.

Propellant plant on Mars
A key part of the Mars system architecture that Musk conceptualized in order to radically decrease the cost of spaceflight to beyond-Earth-orbit destinations is the placement and operation of a physical plant on Mars to handle production and storage of the propellant components necessary to launch and fly the cargo and passenger spaceships back to Earth, or perhaps to increase the mass that can be transported onward to destinations in the outer Solar System. Coupled with the Earth-orbit tank filling prior to the journey to Mars, and the fully reusable launch vehicles and spacecraft, all three elements are needed to reduce the transport cost by the multiple orders of magnitude that Musk sees as necessary to support sustainable colonization of Mars.

The first cargo spaceship to transit to Mars was projected to carry a small propellant plant as a part of its cargo load. The plant is expected to be expanded over multiple synods as more equipment arrives, is installed, and placed into mostly-autonomous production.

The propellant plant intends to take advantage of the large supplies of carbon dioxide and water resources on Mars, mining the water (H2O) from subsurface ice and collecting CO2 from the atmosphere. A chemical plant will process the raw materials by means of electrolysis and the Sabatier process to produce molecular oxygen (O2) and methane (CH4), and then liquefy it to facilitate long-term storage and ultimate use. Analysis of a Mars-based chemical plant based on Earth-constructed pressurized modules that fit whole into the cargo hold of an ITS cargo ship, analogous to shipping containers, has been proposed to initiate a chemical industry on Mars.

Launch facility
The initial launch site planned in 2016 for the launch and rapid reuse of the launch vehicle was to be the SpaceX leased facility at historic Launch Pad 39A along the Florida space coast. While originally thought to be too small to handle the very large launch vehicle, the optimized size of the Raptor engine was fairly close to the physical size of the Merlin 1D, although each engine will have approximately three times the thrust. Falcon Heavy will launch from 39A with 27 Merlin engines; the 2016-design ITS LV was intended to launch with 42 Raptor engines.
 * Initial launch site

Musk indicated on September 27, 2016 that the launch vehicle would launch from more than one site. A prime candidate for the second launch site is somewhere along the south Texas coast.
 * Multiple launch sites


 * Launch facility history

, no launch site had yet been selected for the super-heavy lift rocket and the then-named "Mars Colonial Transporter." SpaceX indicated at the time that their leased facility in Florida at Launch Pad 39A would not be large enough to accommodate the vehicle as it was understood conceptually in 2014, and that therefore a new site would need to be built in order to launch the >10-meter diameter rocket.

In September 2014, Elon Musk indicated that the first person to go to another planet could possibly launch from the SpaceX South Texas Launch Site, but did not indicate at the time what launch vehicle might be used to carry humans to orbit.

Mars early missions
Musk has indicated that the earliest SpaceX-sponsored missions would have a smaller crew and use much of the pressurized space for cargo.

As envisioned in 2016, the first crewed Mars missions might be expected to have approximately 12 people, with the primary goal to "build out and troubleshoot the propellant plant and Mars Base Alpha power system" as well as a "rudimentary base." In the event of an emergency, the spaceship would be able to return to Earth without having to wait a full 26 months for the next synodic period.

Before any people are transported to Mars, some 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.

The early concepts for "green living space" habitats include glass panes with a carbon-fiber-frame geodesic domes, and "a lot of miner/tunneling droids [for building] out a huge amount of pressurized space for industrial operations." But these are merely conceptual and not a detailed design plan.

Mars settlement concept
As of 2016 when publicly discussed, SpaceX the company is concentrating its resources on the transportation part of the overall Mars architecture project as well as an autonomous propellant plant that could be deployed on Mars to produce methane and oxygen rocket propellants from local resources. If built, and if planned objectives are achieved, then the transport cost of getting material and people to space, and across the inner Solar System, will be reduced by several orders of magnitude. SpaceX CEO Elon Musk is championing a much larger set of long-term Mars settlement objectives, ones that take advantage of these lower transport costs to go far beyond what the SpaceX company will build and that will ultimately involve many more economic actors—whether individual, company, or government—to build out the settlement over many decades.

In addition to explicit SpaceX plans and concepts for a transportation system and early missions, Musk has personally been a very public exponent of a large systemic vision for building a sustainable human presence on Mars over the very long term, a vision well beyond what his company or he personally can effect. The growth of such a system over decades cannot be planned in every detail, but is rather a complex adaptive system that will come about only as others make their own independent choices as to how they might, or might not, connect with the broader "system" of an incipient (and later, growing) Mars settlement. Musk sees the new and radically lower-cost transport infrastructure facilitating the build up of a bottom-up economic order of other interested parties—whether companies, individuals, or governments—who will innovate and supply the demand that such a growing venture would occasion.

While the initial SpaceX Mars settlement would start very small, with an initial group of about a dozen people, with time, Musk hopes that such an outpost would grow into something much larger and become self-sustaining, at least 1 million people. According to Musk,"Even at a million people you’re assuming an incredible amount of productivity per person, because you would need to recreate the entire industrial base on Mars. You would need to mine and refine all of these different materials, in a much more difficult environment than Earth. There would be no trees growing. There would be no oxygen or nitrogen that are just there. No oil.""Excluding organic growth, if you could take 100 people at a time, you would need 10,000 trips to get to a million people. But you would also need a lot of cargo to support those people. In fact, your cargo to person ratio is going to be quite high. It would probably be 10 cargo trips for every human trip, so more like 100,000 trips. And we’re talking 100,000 trips of a giant spaceship."

The notional journeys outlined in the November 2016 talk would require 80 to 150 days of transit time, with an average trip time to Mars of approximately 115 days (for the nine synodic periods occurring between 2020 and 2037). In 2012, Musk stated an aspirational price goal for such a trip might be on the order of US$500,000 per person, but in 2016 he mentioned that long-term costs might become as low as US$200,000.

, the complex project has financial commitments only from SpaceX and Musk's personal capital. The Washington Post pointed out that "The [US] government doesn't have the budget for Mars colonization. Thus, the private sector would have to see Mars as an attractive business environment. Musk is willing to pour his wealth into the project" but it will not be enough to build the colony he envisions.

Funding
The extensive development and manufacture of much of the space transport technology has been through 2016, and is being privately funded by SpaceX. The entire project is even possible only as a result of SpaceX multi-faceted approach focusing on the reduction of launch costs.

, SpaceX was expending "a few tens of millions of dollars annually on development of the Mars transport concept, which amounts to well under 5 percent of the company’s total expenses", but expects that figure to rise to some US$300 million per year by around 2018. The cost of all work leading up to the first Mars launch was expected to be "on the order of US$10 billion" and SpaceX expected to expend that much before it generates any transport revenue. No public update of total costs before revenue was given in 2017 after SpaceX redirected to the small launch vehicle design of the BFR.

Musk indicated in September 2016 that the full build-out of the Mars colonialization plans would likely be funded by both private and public funds. The speed of commercially available Mars transport for both cargo and humans will be driven, in large part, by market demand as well as constrained by the technology development and development funding.

Elon Musk said in 2016 that there is no expectation of receiving NASA contracts for any of the Mars architecture system work. He also indicated that such contracts, if received, would be good.

SpaceX tentative calendar for Mars missions
In 2016 SpaceX announced that there would be a number of early missions to Mars prior to the first trip of the new large composite-structure spacecraft. The early missions are planned to collect essential data to refine the design, and better select landing locations based on the availability of extraterrestrial resources such as water and building materials.

2016 plans
, SpaceX announced plans to fly its earliest missions to Mars using its Falcon Heavy launch vehicle prior to the completion, and first launch, of any ITS vehicle. Later missions utilizing this technology—the ITS launch vehicle and Interplanetary Spaceship with on-orbit propellant refill via ITS tanker—were to begin no earlier than 2022. At the time, the company was planning for launches of research spacecraft to Mars using Falcon Heavy launch vehicles and specialized modified Dragon spacecraft, called "Red Dragon". Due to planetary alignment in the inner Solar System, Mars launches are typically limited to a window of approximately every 26 months. As announced in June 2016, the first launch was planned for Spring 2018, with an announced intent to launch again in every Mars launch window thereafter. In February 2017, however, the first launch to Mars was pushed back to 2020, and in July 2017, SpaceX announced it would not be using a propulsively-landed "Red Dragon" spacecraft at all for the early missions, as had been previously announced.

The tentative mission manifest from November 2016 included three Falcon Heavy missions to Mars prior to the first possible flight of an ITS to Mars in 2022:
 * 2018: initial SpaceX Mars mission: the Red Dragon, a modified Dragon 2 spacecraft launched by Falcon Heavy launch vehicle.
 * 2020: second preparatory mission: at least two Red Dragons to be injected into Mars transfer orbit via Falcon Heavy launches
 * 2022: third uncrewed preparatory mission: first use of the entire ITS system to put a spacecraft on an interplanetary trajectory and carry heavy equipment to Mars, notably a local power plant.
 * 2024: first crewed ITS flight to Mars according to the "optimistic" schedule Musk discussed in October 2016, with "about a dozen people".

2017 revisions
In February 2017, public statements were made that the first Red Dragon launch would be postponed to 2020. It was unclear at that time whether the overall sequence of Mars missions would be kept intact and simply pushed back by 26 months. In July 2017, Musk announced that development of propulsive landing for the Red Dragon lander capsule was cancelled in favor of a "much better" landing technique, as yet unrevealed, for a larger spacecraft.

A 9 m-diameter BFR rocket design, using the same Raptor engine technology and carbon-fiber composite materials of the earlier ITS, was unveiled at International Astronautical Congress on 29 September 2017. It is similar to the ITS design, but smaller. Musk announced additional capabilities for the BFR, including Earth missions that could shuttle people across the planet in under an hour (most flights would be less than half an hour), Lunar missions, as well as Mars missions, that would aim to put the first humans on the planet by 2024. SpaceX now plans to focus mainly on one launch vehicle for these missions - the BFR. By focusing the company's efforts onto just a single launch vehicle, the cost, according to Musk, can be brought down significantly. SpaceX also plans to use a smaller version of BFR for Earth-orbit missions. Construction of these rockets will begin in 2018, according to Musk.