SpaceX Starship (Wikimedia)
Science and technology – 7
SpaceX’s Starship programme is an attempt to build space launch and transport equipment to open up the Solar System for travel and cargo delivery at greatly reduced cost, and increased capacity and frequency. It seems a good time to collect the details together in one place because SpaceX is now almost ready to put Starship into orbit and launch Starlink satellites from it. That’s a very significant development.
Progress so far can be divided into three major phases that SpaceX terms ‘Blocks’. Think of them as versions. Block Zero began the development of early forms of hardware, Block One continued this to test all aspects of flight and landing, and Block Two has just ended with the very successful Flight 11, and now Block Three has begun. Three kinds of hardware are being developed for each block- Stage Zero is the ground launch equipment, the launch mounts, fuel storage and loading facilities, and the launch control and monitoring equipment. Stage One is the Superheavy Booster that places the Starship orbital vehicle into flight above the bulk of the atmosphere, while Stage Two is Starship itself which accelerates to orbital velocity or beyond. Specialised versions of Stage Two will act as orbital fuel tankers, and eventually land on the Moon, Mars and perhaps other destinations. I list below, only flights regarded as at least partially successful. Let’s step though them in sequence. It’s also well worth watching Scott Manley’s video overview of the entire Starship test program.
Block Zero
Flight 0A (3rd April 2019) (There are no videos) – The first flight used Starhopper, a reduced size, single-engined, test vehicle with an early version of the Raptor engine burning liquid methane and liquid oxygen. It was a tethered hop and reached the giddy height of 0.3 m. But this was enough to prove the engine and its control systems were performing correctly.
Flight 0B (5th April 2019) (There are no videos) -Starhopper’s second flight, tethered again and reaching a height of 1 m. SpaceX had no Flight number designations for these tethered hops.
Flight 1 (25th July 2019) (There are no videos)- This time Starhopper flew untethered, reached a height of 20 m, and landed safely. This proved engine gimballing was adequate for a controlled ascent and descent.
Flight 2 (27th August 2019) (Video) – This was Starhopper’s final flight, reaching 150 m and travelling horizontally before safely landing proving horizontal movements could be well-controlled. It was retired after this flight.
Flight 3 (4th August 2020) (Video) – The first flight of a full size Starship (SN5), another 150 m hop, the payload section was absent and a steel mass simulator was carried instead, still using just a single Raptor engine. Once again, the proven flight envelope was increased, this time with a vehicle of similar size and weight to a Starship returning from orbit.
Flight 4 (3rd September 2020) (Video) – 150 m hop, Starship (SN6), a similar flight to SN5.
Flight 5 (9th December 2020) (Video) – 12.5 km, Starship (SN8) had a successful launch and flight but failed landing. The mass simulator was replaced by a nose cone and control flaps this time, and three Raptor engines were installed. The new belly flop and flip manoevres succeeded on their first attempt, but the landing failed. This flight climbed to the same altitude as the highest passenger planes.
Flight 6 (3rd March 2021) (Video) – 10 km, Starship (SN9) Similar success and failure to Flight 5.
Flight 7 (3rd March 2021) (Video) – 10 km, Starship (SN10). This was the first successful landing, though it was a very heavy landing and the damaged ship exploded soon after landing.
Flight 8 (30th March 2021) (Video) – 10 km, Starship (SN11). The vehicle exploded during descent.
Flight 9 (5th May 2021) (Video) – 10 km Starship (SN15). This was the first completely successful flight and landing. There was a fire in the engine compartment after landing, but this was eventually extinguished and the landed Starship survived. So now SpaceX had a design that could could complete the horizontal descent, flip to a vertical position at low altitude, and land.
Block One
Block One flights began in April 2023, the objective was to move to flying both the Superheavy booster and the Starship orbital vehicle together, having already mastered the horizontal fall of Starship and the flip manoevre needed to bring it back for a landing. It’s worth looking at Scott Manley’s excellent video summary of the Block One series of flights.
Integrated Flight Test 1 (20th April 2023) (Video) (Scott Manley’s analysis) – Orbital test fight, the combined craft managed to take off with twice the thrust of the Saturn 5 Moon rocket, though five of the thirty-three booster engines failed and the Starship failed to separate from the booster. So most of the flight objectives were met. This represented a huge step forward for Starship; SpaceX now had a system that could lift off and reach the upper atmosphere. Unfortunately the launch all but destroyed the launch pad (stage 0).
Integrated Flight Test 2 (18th November 2023) (Video) – This time all the booster engines lit correctly and stage separation was successful. But both stages were lost. Stage separation was another large step forward for Starship.
Integrated Flight Test 3 (14th March 2024) (Video) – This time all the booster engines lit correctly and fired for the full intended flight duration. Stage separation was successful too and Starship could have achieved orbit had its six engines been allowed to fire just a little longer. However, the ship failed during its brutal re-entry.
Integrated Flight Test 4 (18th November 2023) (Video) – This time all the booster engines lit correctly and stage separation was successful. The boostback burn was good too, but the landing burn failed and Superheavy was lost shortly before it was expected to land. Meanwhile, Starship fired all six engines for stage separation and the boost to almost orbital velocity. For safety reasons there was again no attempt to reach full orbit on this flight. but the Starship started to re-enter the atmosphere over the Indian Ocean before reaching Australia. The Pez dispenser cargo door opened, but failed to close fully. Starship re-entered under control of the flaps but didn’t attempt a landing burn. This flight took the project forward just as far as intended, so a good result and an excellent preparation for following flights. SpaceX had demonstrated atmospheric re-entry under flap control.
Flight Test 5 (13th October 2024) (Video) (Scott Manley’s analysis) – The Superheavy Booster delivered Starship to the upper atmosphere correctly, returned to the launch site, and was successfully caught for the first time, another huge step forward. Starship made a safe atmospheric re-entry and splash down in the Indian Ocean on target and under control. This was the first time both the booster and Starship completed a full mission.
Flight Test 6 (19th November 2024) (Video) – The Superheavy Booster was diverted from a catch attempt and landed in the ocean because the catch mechanism on the tower signalled it was unready. Starship re-lit one of its Raptor engines in flight and splashed down successfully and on target in the Indian Ocean. The re-light is important because it builds confidence that a fully orbital Starship would be able to deorbit in a properly planned way and not come down unpredictably, endangering people and property on the ground.
Block Two
Block Two flights began with flight test 7. The Block Two Superheavy Booster and Block Two Starship are redesigns based on lessons learned from flying the Block One versions.
Flight Test 7 (16th January 2025) (Video) (Scott Manley’s analysis) – The Superheavy Booster flew nearly perfectly and was caught successfully by the arms on the launch tower as with Flight Test 5. However, Starship suffered some engine failures and was destroyed before performing the engine relight and other tests it was flown to perform.
Flight Test 8 (6th March 2025) (Video) (Scott Manley’s analysis) – The Superheavy Booster performed well again and was caught by the tower arms. But Starship lost control and was destroyed again. At this point SpaceX have a successful booster design but the ship is still not reliable.
Flight Test 9 (27th May 2025) (Video) (Scott Manley’s analysis) – This time, the Superheavy Booster flew flawlessly but was deliberately not caught on this flight. It was brought back at an experimentally higher angle of attack. Starship fired all six engines for the full time expected and then shut them down cleanly.
Flight Test 10 (26th August 2025) (Video) (Scott Manley’s analysis)- One of Superheavy’s centre engines was deliberately disabled and it used an off-centre to complete a successful landing burn over the Gulf of Mexico. There was no attempt to catch Superheavy, but the test showed that it could have been caught even using the off-centre engine. Starship fired a single engine briefly to demonstrate it could have been safely de-orbited if required, and some dummy Starlink satellites were deployed successfully as well. Despite an unexpected explosion during re-entry, the vehicle survived, performed the landing flip manoevre and touched down successfully and on target in the Indian Ocean.
Flight Test 11 (13th October 2025) (Video) (Scott Manley’s analysis)- This was the most successful test flight so far. Both the Booster and the Ship performed flawlessly and met all objectives. The dummy satellites were released, an engine was re-lit in space and the ocean landing was perfect as well.
Block three
The first Block Three flight is expected early in 2026. Stages 0, 1 and 2 will all be fresh designs and we expect further advances including orbital flights releasing a new version of the Starlink satellites, more booster catches, and the first Starship catches as well. There may be tests of fuel transfer between ships, tests of Moon landing hardware, and the first launches of Starships to Mars, possibly with a crew of robots. Get ready for an exciting time.
For a taste of what may be to come, take a look at AlphaTech’s latest video.
See also:
- Everyday Astronaut (The fullest detail) – You Tube
- List of Starship upper stage flight tests – Wikipedia
- Marcus House (Excellent weekly updates)- YouTube
- Scott Manley – (Great technical insights) – YouTube
- SpaceX Starship – Wikipedia
- SpaceX Starship design history – WIkipedia
- SpaceX Superheavy – Wikipedia
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