SpaceX
SpaceX’s third Falcon Heavy launch is just one month away
SpaceX is exactly one month away from Falcon Heavy’s next scheduled launch, an important mission for the US Air Force known as Space Test Program 2 (STP-2). Carrying 24 satellites of various sizes, Falcon Heavy is scheduled to lift off for the third time as early as June 22nd.
In support of the mission, SpaceX will need to completely integrate Falcon Heavy and prepare the rocket for a routine static fire test approximately one week prior to launch, sometime in mid-June. STP-2 will be critical to both SpaceX and the USAF for a number of reasons, ranging from rocket reusability to the future of US military launch procurement.
ICYMI: LightSail 2 is set to launch next month aboard a #SpaceX Falcon Heavy! Our citizen-funded solar sail is officially scheduled to lift off on 22 June 2019: https://t.co/J2AC5JQ1Kr pic.twitter.com/lC1MJoeh3C— Planetary Society (@exploreplanets) May 21, 2019
Rapid Falcon Heavy reuse
From a technological standpoint, Falcon Heavy Flight 3 will be a milestone in large part due to its reuse of two Falcon Heavy side boosters, previously flown on April 11th as part of Falcon Heavy’s Arabsat 6A commercial launch debut. Around eight minutes after launching the ~6450 kg (14,200 lb) satellite on its way to an exceptionally high transfer orbit of 90,000 km (56,000 mi), side boosters B1052 and B1053 completed flawless landings at LZ-1 and LZ-2.
Both boosters were quickly ‘broken over’ (brought horizontal) and transported to Pad 39A’s main hangar for inspection and refurbishment. Relative to almost all other Block 5 boosters, Falcon Heavy Flight 2’s side boosters were subjected to a uniquely gentle reentry thanks to a lower velocity stage separation. As such, they should be easier to turn around than most, but given that the boosters are also acting as partial pathfinders for the reuse of actual Falcon Heavy hardware, they are unlikely to break any records.
Sadly, the first Falcon Heavy Block 5 center core – B1055 – was toppled in high seas while still aboard drone ship Of Course I Still Love You (OCISLY), cutting short any possibility of future reuses of the thoroughly scorched booster. For unknown reasons, be it an unrelated USAF requirement or SpaceX simply choosing caution, plans already accounted for a new center core flying on STP-2, although both Arabsat 6A side boosters were to be reused. Believed to be B1057, that new Falcon Heavy center core completed its Texas acceptance testing in late April and shipped to Cape Canaveral, Florida soon after.
An Air Force first
Aside from offering a chance for SpaceX to tie its 72-day Falcon 9 turnaround record twice, STP-2 has unexpectedly become a keystone of the US military’s interest in certifying flight-proven rockets for military launches. The USAF has described the reuse of Falcon Heavy boosters on STP-2 as a step forward for all future reusable launch vehicles, but the reality is that SpaceX is and will remain the only player in town until 2022 at the earliest. The next closest entrant – Blue Origin’s New Glenn rocket – is unlikely to be ready for its launch debut before late ’21 or early ’22. ULA’s “SMART” reuse of Vulcan rocket engine sections is unlikely to be ready before the mid-2020s, likely 2024-2026.
SpaceX, however, has already reused Falcon 9 boosters more than 20 times on orbital-class missions, and the frequency of reuse is only likely to increase with the introduction of the final major Falcon 9 and Heavy upgrade, known as Block 5. Designed with a nominal lifespan of 10+ launches, each booster can support a huge number of missions and also offers the potential to dramatically reduce launch costs down the road. Additionally, as noted by VP of Launch Reliability Hans Koenigsmann, SpaceX firmly believes that reliability will come hand in hand with routine reuse, as each recovered booster can serve as a treasure trove of data. Thanks to reusability, SpaceX can fill recoverable boosters to the brim with cameras and gather full-resolution telemetry otherwise inaccessible for an expendable rocket.
The matter of launch costs is not a particularly significant concern of the US military, mainly a consequence of the incredibly disproportionate relationship between the cost of launch and the cost the military satellite payloads. An excellent example of this disparity can be found in SpaceX’s December 2018 launch of the USAF’s first GPS III satellite: SpaceX’s launch contract cost $82M, while the Lockheed Martin-built spacecraft aboard cost no less than ~$600M.
However, reusable rockets are quite plainly the future of space launch, evidenced by SpaceX’s meteoric rise and rapid cannibalization of the global commercial launch market. As a partial result, the survival of ULA – a Lockheed Martin-Boeing cooperative that builds the Delta IV and Atlas V rockets – is almost completely dependent upon military development and launch contracts. Blue Origin, however, is now offering the promise of an independently stable launch provider thanks to continual funding from owner Jeff Bezos, and reusability will be an absolute necessity if its massive New Glenn rocket is to succeed.
In short, the USAF is faced with a simple proposition: get behind reusable rockets or risk falling behind. SpaceX is more than happy to ease the conservative military branch into the new era, and Falcon Heavy’s STP-2 launch will be a major step in the right direction. Thanks to its reuse of two side boosters, Air Force officials will be able to observe the process of rapid refurbishment firsthand, providing information they will then use to develop certification requirements for flight-proven rockets. More generally, STP-2 will also act as a dedicated demonstration that SpaceX and the USAF will use to fully certify Falcon Heavy for military launches, hopefully ending Delta IV Heavy’s decade-long monopoly over military heavy lift.
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SpaceX’s Raptor engine family has steadily increased sea-level thrust while simultaneously reducing mass, turning iterative engineering gains into substantially higher performance for the Super Heavy booster. CEO Elon Musk shed more light on how powerful Raptor 4 will be, and it’s pretty crazy.
Raptor 1 delivered 185 metric tons of thrust at roughly 2,080 kilograms, while Raptor 2 raised that to 230 tons while cutting mass to about 1,630 kilograms. SpaceX data for Raptor 3 lists a target of 280 tons at 1,525 kilograms (with further reductions in associated vehicle hardware), while operational flight ratings have been cited near 250 tons.
This morning, Elon Musk stated that Raptor 4 is expected to reach 300 tons of sea-level thrust at roughly the same mass as Raptor 3. Across these versions, thrust has risen by more than 60 percent from the first engines while engine mass has fallen, producing a sharp improvement in thrust-to-weight ratio. This is a true testament to how great SpaceX engineering has been:
🚀 Elon says Raptor 4 will make 300 tons of thrust at sea level at roughly the same mass as Raptor 3.
How far Raptor has come:
Raptor 1: 185 tf, 2,080 kg
Raptor 2: 230 tf, 1,630 kg
Raptor 3: 250 tf, 1,525 kg
Raptor 4: 300 tf33 on Super Heavy = ~9,900 tf, nearly 3x Saturn V https://t.co/HQDswZhyvL
— TESLARATI (@Teslarati) October 26, 2026
With 33 engines on SuperHeavy, the jump from earlier versions to a 300-ton Raptor 4 would produce roughly 9,900 metric tons of total liftoff thrust, nearly three times the Saturn V’s approximately 3,400 metric tons from its five F-1 engines.
This is not just a larger number on a data sheet, either, as sea-level thrust is the force available the moment the vehicle leaves the pad. This is when it is heaviest and still deep in Earth’s gravity well and dense atmosphere.
Higher levels of sea-level thrust directly improves the initial thrust-to-weight ratio of the full stack. A higher ratio produces faster acceleration off the pad, which shortens the time the rocket has to spend fighting gravity, and gravity losses during the first minute or two of the flight are a major drain on total available delta-v. Every second shaved off of that early climb preserves more propellant energy for reaching orbital velocity or for carrying extra payload.
Because Super Heavy’s engine count is constrained by vehicle diameter and packing density, increasing thrust per engine is the most straightforward way to raise total liftoff performance without redesigning the booster structure or design.
The same-mass target for Raptor 4 is equally important. Holding engine mass roughly constant while raising thrust improves the engine’s own thrust-to-weight ratio and reduces the structural and propellant mass fraction that must be carried solely to support the engines.
Earlier Raptor iterations also simplified or eliminated extensive vehicle-side hardware such as heat shields. These gains compound: more force for less installed mass leaves additional capacity for propellant, payload, or operational margins such as engine-out capability.
For Starship’s architecture, the practical effects are large. Greater liftoff thrust supports heavier vehicles, larger propellant loads, and higher payloads to low Earth orbit, figures SpaceX has targeted in the 100-plus-ton reusable range. That capacity underpins orbital refueling, lunar missions, and eventual Mars cargo and crew flights.
Continued growth in sea-level thrust therefore tightens the gap between theoretical rocket performance and the high flight rates and reusability needed to make large-scale space transport practical.
Tesla expanded its Robotaxi geofence in Houston, Texas, today, enlarging the service area and drawing a new rocket-shaped boundary across the city’s northwestern and central parts.
Although CEO Elon Musk said it was just a coincidence, the expansion seems to be an ode to SpaceX and its potential merger with Tesla.
🚨 Tesla has just expanded its Robotaxi geofence in Houston
It looks a lot like a rocket — we all remember the shape in Austin 🤣 https://t.co/cFOPEuiJ4u
— TESLARATI (@Teslarati) October 26, 2026
The official Tesla Robotaxi account announced the change with the lines “Houston, we have liftoff” and “Bigger service area now live,” pairing them with a map overlay.
The prior white geofence, roughly 25 square miles covering Jersey Village, Harvest Bend, and the Willowbrook corridor along U.S. 290 and State Highway 249, now sits inside a larger blue zone that stretches southeast toward Bellair and closer to central Houston.
Houston’s Robotaxi service launched on April 18, 2026, the same day as Dallas, as Tesla’s first unsupervised public expansion beyond Austin. From the start, the vehicles were Model Ys running without anyone in the front seats, booked through the dedicated Tesla Robotaxi app and open to the public inside the geofence.
Trackers measured the initial zone at about 25 square miles; by late September it had not grown substantially. Community and registry data indicated a modest local fleet of unsupervised Model Ys, while dozens to nearly 200 Cybercabs, the purpose-built, steering-wheel-free two-seaters, have been spotted staging and testing in Houston lots, though public Cybercab rides remain limited to Austin for now.
Across the broader Robotaxi program, Tesla began public Robotaxi rides in Austin in June 2025, as a small geofence and vehicles with safety monitors became available for a ride-hailing service. Later on, Tesla removed the monitors and steadily expanded the service area until it covered most of the Austin metro area.
Unsupervised Robotaxi services now run in six cities: Austin, Dallas, Houston, Miami, Orlando, and Tampa. Cumulative driverless miles reported by the company have reached several million. The Cybercab entered public service in Austin in early September 2026 and has scaled rapidly there. The company has also said that Dallas is next for Cybercab rides in November, with further cities and 24/7 hours targeted by year-end, plus fleet-operator sales of the vehicle.
Waymo also operates a fully driverless service in Houston, which has been open to the public since August of this year.
The Houston expansion continues Tesla’s pattern of starting with tightly controlled validation zones before widening coverage as real-world data accumulates, while the rocket motif on the map underscores the company’s habit of injecting visual flair into its autonomy rollout.
Riders inside the new boundary can request unsupervised Model Y trips in the Robotaxi app; exact operating hours and further Cybercab availability remain subject to app updates and company statements.
Elon Musk
The Starship moon landing number NASA and Elon Musk can’t agree on
Musk disputes NASA estimate of 22 Starship launches for Moon landing, predicting 6 to 8.
Elon Musk is disputing a new NASA safety panel estimate of how many Starship launches it will take to put astronauts on the Moon, saying the real number will be less than half the panel’s figure.
On Thursday, NASA’s Aerospace Safety Advisory Panel held its quarterly public meeting. Panel member Charlie Precourt, a former NASA astronaut, flagged the fueling process for SpaceX’s lunar lander as a major risk for Artemis IV, the mission planned to land a crew on the Moon in 2028. “We need to keep our eyes on numerous required fuelings for the lander,” Precourt said, according to Ars Technica. “I think the last estimate is around 22 flights.”
Ars Technica’s Eric Berger posted the comment on X, and Musk replied. “That’s way too high,” Musk wrote. “Actual number will be more like 6 to 8.”
The disagreement comes down to a basic problem with sending a ship as large as Starship to the Moon. Starship burns nearly all of its propellant just reaching Earth orbit, so it cannot continue on to the Moon without stopping for a refill. SpaceX’s answer is a gas station in space. First, a Starship that works as a storage tank, called a depot, is launched into orbit. Then a series of tanker Starships launch one at a time, dock with the depot and pump their leftover propellant into it. Once the depot is full, the lunar lander version of Starship launches, docks, fills up and heads for the Moon.
Every tanker trip is its own full rocket launch, which is why the count matters. More launches mean more time, more cost and more chances for something to go wrong before astronauts ever leave Earth. Berger estimated that even if SpaceX reaches twice weekly Starship launches by the end of 2027, filling a depot at the panel’s number would still take roughly three months.
How many tankers are needed depends mostly on how much propellant each one can carry to orbit and how much is lost along the way. Starship’s fuel and oxygen are stored at extremely cold temperatures, and some of it slowly boils off while waiting in orbit. More is lost in each transfer. NASA appears to be working from what Starship can lift today, while Musk’s range assumes a more capable rocket.
Musk has pushed back on higher counts before. In 2021, after a government document suggested 16 launches, he called that “extremely unlikely” and said eight tankers would be the most required.
Much of the answer depends on hardware SpaceX has not finished flying. As Teslarati noted earlier this year, the company plans to carry out the refueling process with its upgraded V3 Starship, and Precourt described Artemis IV as carrying “a large number of firsts.” He also praised NASA Administrator Jared Isaacman’s team for working to clear obstacles for both SpaceX and Blue Origin, whose Blue Moon lander does not rely on orbital refueling for its first mission.
Tesla has a Cybercab problem nobody saw coming
How SpaceX Is raising Raptor’s sea-level thrust while holding engine mass steady
