SpaceX Mars transportation infrastructure
Elon Musk and SpaceX have proposed to develop a Mars transportation infrastructure in order to facilitate the eventual colonization of Mars. The design includes fully reusable launch vehicles, human-rated spacecraft, on-orbit propellant tankers, rapid-turnaround launch/landing mounts, and local production of rocket fuel on Mars via in situ resource utilization (ISRU). SpaceX' aspirational goal is to put the first humans on Mars by 2024.
As of October 2017[update], the key element of the infrastructure is the BFR or "Big Falcon Rocket". It is a two-stage rocket where the upper stage is also used as spacecraft to reach Mars and to return to Earth. To achieve a large payload, the spacecraft first enters Earth orbit, where it is refuelled before it departs to Mars. After landing on Mars, the spacecraft is loaded with locally produced fuel to return to Earth. The expected payload of BFR is 150 tonnes (330,000 lb) to Mars.
SpaceX intends to concentrate its resources on the transportation part of the Mars colonization project, including the design of a Sabatier propellant plant that will be deployed on Mars to synthesize methane and liquid oxygen as rocket propellants from the local supply of atmospheric carbon dioxide and ground-accessible water ice. However, Musk advocates a larger set of long-term Mars settlement objectives, going far beyond what SpaceX projects to build; a successful colonization would ultimately involve many more economic actors—whether individuals, companies, or governments—to facilitate the growth of the human presence on Mars over many decades.
As early as 2007, Elon Musk 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 in 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.
Development work began in earnest before 2012 when SpaceX started to design the Raptor rocket engine which will propel all versions of the BFR launch vehicle and spacecraft. Rocket engine development is one of the longest subprocesses in the design of new rockets.
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 BFR is designed to fulfill the Mars transportation goals while also launching satellites, servicing the ISS, flying humans and cargo to the Moon, and enabling ballistic transport of passengers on Earth as a substitute to long-haul airline flights.
SpaceX's 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 publicly 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 elementsEdit
The SpaceX Mars architecture, first detailed publicly 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: Additional detail on the Mars transportation architecture was added by Musk in 2017.:33:30–36:55
- 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 at least 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":16:25—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 developmentEdit
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 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 vehicleEdit
The design released in September 2017 for the super-heavy lift launch vehicle BFR was sized to place up to 150 tonnes (330,000 lb) (reusable-mode) or 250 tonnes (550,000 lb) (expendable-mode)—or carry 150 tonnes (330,000 lb) 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 tonnes (660,000 lb) (reusable-mode) or 550 tonnes (1,210,000 lb) (expendable-mode)—or carry 150 tonnes (330,000 lb) 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.
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.
The 2016 design—termed the Interplanetary Spaceship—was 49.5 m (162 ft)-long, had a maximum hull diameter of 12 m, with a 17 m (56 ft)-diameter at its widest point, was powered by nine Raptor engines, and was projected to be capable of transporting up to 450 tonnes (990,000 lb) 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 (3.7 mi/s) and full propellant tanks—was projected to be 450 tonnes (500 tons) to Mars orbit, or 300 tonnes (330 tons) 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.:19:38
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 spacecraftEdit
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.
Propellant plant on MarsEdit
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.
- Initial launch site
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.
- Multiple launch sites
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.
- Launch facility history
As of March 2014[update], 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 missionsEdit
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 conceptEdit
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.
As of September 2016[update], 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.
Outer planet conceptsEdit
The overview presentation on the Mars architecture given by Musk in September 2016 included concept slides outlining missions to the Saturnian moon Enceladus, the Jovian moon Europa, Kuiper belt objects, a fuel depot on Pluto and even the uses to take payloads to the Oort Cloud. "Musk said ... the system can open up the entire Solar System to people. If fuel depots based on this design were put on asteroids or other areas around the Solar System, people could go anywhere they wanted just by planet or moon hopping. 'The goal of SpaceX is to build the transport system ... Once that transport system is built, then there is a tremendous opportunity for anyone that wants to go to Mars to create something new or build a new planet.'" Outer planet trips would likely require propellant refills at Mars, and perhaps other locations in the outer Solar System. This emphasis was totally missing in the update one year later when the smaller BFR launch vehicle and spacecraft were introduced.
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.
As of October 2016[update], 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. In October 2017, he reiterated that "the actual establishment of a base was something that would be handled largely by other companies and organizations. ... 'Our goal is get you there and ensure the basic infrastructure for propellant production and survival is in place', he said, comparing the BFR to the transcontinental railways of the 19th century. 'A vast amount of industry will need to be built on Mars by many other companies and millions of people'.
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 missionsEdit
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.
In 2016, 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".
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 (30 ft)-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. 
- Colonization of Mars
- Effect of spaceflight on the human body
- Health threat from cosmic rays
- Human outpost
- Human spaceflight
- In-situ resource utilization
- Life on Mars
- List of manned Mars mission plans in the 20th century
- Human mission to Mars
- Mars Direct
- Mars to Stay
- Space medicine
- Terraforming of Mars
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the updated version of the Mars architecture: Because it has evolved quite a bit since that last talk. ... The key thing that I figured out is how do you pay for it? if we downsize the Mars vehicle, make it capable of doing Earth-orbit activity as well as Mars activity, maybe we can pay for it by using it for Earth-orbit activity. That is one of the key elements in the new architecture. It is similar to what was shown at IAC, but a little bit smaller. Still big, but this one has a shot at being real on the economic front.
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So it is a bit tricky. Because we have to figure out how to improve the cost of the trips to Mars by five million percent ... translates to an improvement of approximately 4 1/2 orders of magnitude. These are the key elements that are needed in order to achieve a 4 1/2 order of magnitude improvement. Most of the improvement would come from full reusability—somewhere between 2 and 2 1/2 orders of magnitude—and then the other 2 orders of magnitude would come from refilling in orbit, propellant production on Mars, and choosing the right propellant.
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would have to throw a bunch of stuff before you start putting people there. ... It is a transportation system between Earth and Mars.
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[the] spaceship portion of the BFR, which would transport people on point-to-point suborbital flights or on missions to the moon or Mars, will be tested on Earth first in a series of short hops. ... a full-scale Ship doing short hops of a few hundred kilometers altitude and lateral distance ... fairly easy on the vehicle, as no heat shield is needed, we can have a large amount of reserve propellant and don’t need the high area ratio, deep space Raptor engines. ... since the presentation last month, SpaceX has revised the design of the BFR spaceship to add a 'medium area ratio' Raptor engine to its original complement of two engines with sea-level nozzles and four with vacuum nozzles. That additional engine helps enable that engine-out capability ... and will 'allow landings with higher payload mass for the Earth to Earth transport function.' ... The flight engine design is much lighter and tighter, and is extremely focused on reliability.
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First crewed mission would have about a dozen people ...
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In a move that would have seemed crazy a few years ago, Mr. Musk stated that the goal of BFR is to make the Falcon 9 and the Falcon Heavy rockets and their crew/uncrewed Dragon spacecrafts redundant, thereby allowing the company to shift all resources and funding allocations from those vehicles to BFR. Making the Falcon 9, Falcon Heavy, and Dragon redundant would also allow BFR to perform the same Low Earth Orbit (LEO) and Beyond LEO satellite deployment missions as Falcon 9 and Falcon Heavy – just on a more economical scale as multiple satellites would be able to launch at the same time and on the same rocket thanks to BFR’s immense size.