| China’s Long March 7A rocket exploded 85 seconds after liftoff from the Wenchang Space Launch Site on August 10, 2026, at 12:02 UTC, destroying the ChinaSat-4B military communications satellite in a fireball over the South China Sea and triggering a mandatory investigation into the YF-100 engine that powers China’s entire modern rocket fleet. This article covers what happened at Wenchang, what the Long March 7A is and what it carried, why the YF-100 investigation matters across five rocket families, what it means for the Chang’e 7 moon mission targeting late August 2026, and where this failure sits in China’s record-breaking 2026 launch calendar. Universalnest.com tracks this story within its Space Technology and AI News reporting. |
What Happened on August 10 2026: Long March 7A Explodes 85 Seconds After Liftoff at Wenchang
China’s Long March 7A rocket exploded approximately 85 seconds after liftoff from Launch Complex 2 at the Wenchang Space Launch Site on the evening of August 10, 2026, generating a large fireball and debris cloud over the South China Sea while still ascending through the lower atmosphere, with state news agency Xinhua confirming the failure approximately three hours after the launch.
The rocket lifted off at 12:02 UTC (8:02 p.m. Beijing local time). The explosion occurred during the joint burn of the first stage and four strap-on boosters, which is the phase of maximum aerodynamic pressure, referred to in aerospace engineering as Max-Q, and the most mechanically stressful point of any rocket ascent. At 85 seconds into flight, the vehicle had not yet reached first-stage separation, which typically occurs just under three minutes after liftoff.
Xinhua’s official statement described the event as “an anomaly during flight” and confirmed that the mission was unsuccessful and the cause was under analysis and investigation. Spectators near the coastal spaceport captured the fireball on video; footage spread across social media platforms within hours of the event. Jonathan McDowell, an astronomer at the Center for Astrophysics at Harvard and Smithsonian, confirmed that the rocket was “destroyed at relatively low altitude and velocity,” with neither the payload nor any debris reaching orbit. Both the rocket and satellite were lost over the South China Sea.
Whether the flight termination system was triggered by anomalous sensor readings or whether a propulsion or structural failure produced the explosion spontaneously is not yet confirmed by CASC.
What Is the Long March 7A: Specifications, History, and Its Only Prior Failure
The Long March 7A is China’s primary medium-lift launch vehicle for geostationary transfer orbit missions, standing 60.1 metres tall, capable of delivering 7,000 kilograms to geostationary transfer orbit and 12,000 kilograms to low Earth orbit, designed by chief engineer Fan Ruixiang, and operated by the China Aerospace Science and Technology Corporation since its debut in March 2020.
The rocket uses a three-stage configuration. The first two stages come from the Long March 7; the third stage uses a liquid hydrogen and liquid oxygen cryogenic propulsion system derived from the Long March 3A series. This design was built specifically to fill China’s GTO payload gap between the Long March 3B (5.5 tonnes) and the Long March 5 (14 tonnes). Four strap-on boosters supplement the core stage using kerolox (liquid oxygen and kerosene) propellant. The rocket launches from Wenchang, which sits at 19°N latitude, a low inclination that allows larger GTO payloads than China’s inland launch sites.
August 10, 2026 was the Long March 7A’s 18th mission since its debut. That debut in March 2020 also failed, with the root cause confirmed as LOX cavitation in the booster feed line. CASC grounded the vehicle, redesigned the affected components, and returned the Long March 7A to service in approximately March 2021, roughly one year later. Between 2021 and August 10, 2026, the vehicle completed 16 consecutive successful missions before the Wenchang explosion.
| Specification | Value |
| Height | 60.1 metres (197 feet) |
| Core diameter | 3.35 metres |
| Stages | 3 + 4 strap-on boosters |
| GTO payload capacity | 7,000 kg (7 metric tons) |
| LEO payload capacity | 12,000 kg (12 metric tons) |
| Liftoff thrust | 7,128 kilonewtons |
| Fairing diameter | 4.2 metres |
| First flight | March 2020 (failure) |
| Chief designer | Fan Ruixiang |
| Operator | CASC (China Aerospace Science and Technology Corporation) |
| Launch site | Wenchang Space Launch Site, Hainan Province |
ChinaSat-4B: The Military Communications Satellite Destroyed in the Explosion
ChinaSat-4B (Chinese designation: Zhongxing-4B) was a geostationary communications satellite operated by China Satellite Communications, the newest planned addition to the ChinaSat fleet since June 2025, intended to deliver radio, television, and telecommunications services to global users from geostationary orbit at approximately 36,000 kilometres altitude, and is now a confirmed total loss.
The satellite’s Chinese designation carries specific significance. Low-numbered Zhongxing satellites have historically been associated with Chinese military communications, and the geostationary orbit mission profile of ChinaSat-4B is consistent with previous classified military satellite deployments under the same series. The exact payload specifications were not released publicly by CASC or any Chinese government agency before the launch, which is itself consistent with classified mission protocols.
China Satellite Communications described the satellite’s role as providing “various radio, television, and communication services to global users.” The fleet’s previously newest satellite had launched in June 2025, and ChinaSat-4B was positioned to fill an operational requirement within China’s military and commercial geostationary communications architecture. Geostationary communications satellites require multiple years to design, manufacture, and test; a replacement cannot be fielded on a short timeline. Jonathan McDowell’s confirmation that neither the satellite nor any debris reached orbit means the loss is total and the replacement planning process starts from zero.
The YF-100 Engine Investigation: Why This Failure Threatens China’s Entire Modern Rocket Fleet
The YF-100 engine, which powers not only the Long March 7A but also the Long March 5, Long March 6, Long March 7, and Long March 8 rocket families, has been placed under mandatory fleet-wide investigation following the August 10 explosion, because the failure at 85 seconds occurred during the joint burn of the first stage and four strap-on boosters, all of which are YF-100-powered.
The YF-100 burns liquid oxygen and kerosene (LOX/RP-1, kerolox) and generates approximately 1,200 kilonewtons, or 270,000 pounds, of sea-level thrust per engine. It has powered China’s modern medium and heavy rocket programme for approximately ten years. Its role across the Long March family means that a confirmed YF-100 anomaly does not ground one vehicle; it places every vehicle sharing the engine under mandatory scrutiny at the same time.
The 2020 failure of the Long March 7A’s debut mission provides the clearest recovery precedent. CASC traced that failure to LOX cavitation in the booster feed line, redesigned the affected components, and returned the rocket to service in approximately one year. In 2026, the consequences of a similar investigation reach further. The Long March 7A handles China’s primary geostationary transfer orbit queue for both civil and military satellites. The Long March 5, China’s most powerful active rocket, also uses YF-100 engines in its four strap-on boosters, and it carries the Chang’e 7 moon mission. Long March 6, 7, and 8 each share the same propulsion system. A confirmed systemic engine problem would affect all of them, simultaneously, at a point when China is pursuing its most ambitious annual launch programme ever.
CASC had not issued a formal technical root-cause statement by the time of publication. In-production Long March 7A vehicles at the China Academy of Launch Vehicle Technology have been halted for inspection pending the investigation findings.
| Rocket Using YF-100 | Primary Role | Status After Investigation |
| Long March 7A | GTO satellite missions (civil and military) | Grounded — vehicle directly involved in failure |
| Long March 5 | Heavy-lift; Chang’e missions, space station cargo | Under investigation (four YF-100-powered boosters) |
| Long March 7 | Medium-lift; cargo and satellite missions | Under review |
| Long March 6 | Medium-lift; commercial and government LEO | Under review |
| Long March 8 | Medium-lift; commercial LEO, reusable variant | Under review |
Chang’e 7 at Risk: China’s Moon Mission Is at Wenchang and Its Rocket Shares the YF-100
Chang’e 7, China’s most complex robotic Moon mission and its first attempt to land at the lunar south pole, was targeting a late August 2026 launch window from Wenchang, approximately two weeks after the Long March 7A explosion, and faces a direct operational threat because its Long March 5 carrier rocket uses YF-100 engines in its four strap-on boosters.
The mission combines four spacecraft elements: an orbiter, a lander, a rover, and a miniature hopping probe designed for multiple independent flights of at least 10 kilometres into permanently shadowed craters at the lunar south pole. It operates with support from the Queqiao-2 relay satellite already positioned in lunar orbit. The total mission launch mass is 8,200 kilograms. The planned landing site is near Shackleton crater at 88.8°S, 123.4°E, one of the coldest and most scientifically significant environments accessible in the inner solar system.
The primary scientific goal is confirming the presence of water ice. No surface mission has yet placed instruments directly into the Moon’s permanently shadowed south pole craters. Chang’e 7’s hopping probe is built to do precisely that, drilling for and analysing material in craters that have received no direct sunlight for potentially billions of years. Confirmed water ice matters beyond its scientific interest: split into hydrogen and oxygen through electrolysis, it becomes rocket propellant and life support oxygen, making lunar south pole resources strategically significant for any sustained human presence on the Moon.
The Long March 5 Y14 rocket for the Chang’e 7 mission arrived at Wenchang in mid-July 2026 and was in final assembly alongside the spacecraft on August 10. A YF-100 investigation producing even a short grounding of the Long March 5 pushes the late August launch window to September at the earliest. Chang’e 7 was already scheduled to reach the south pole before NASA’s VIPER rover, which is targeting no earlier than 2027 following programme delays; a multi-month delay closes that window and hands the south pole’s first surface confirmation attempt to the American programme.
China’s 2026 Space Programme: A 140-Launch Target, a Fourth Failure, and the Cost of Grounding
China entered 2026 targeting approximately 140 orbital launches, a 52% increase over the 93 missions completed in 2025 and the most ambitious annual launch figure ever set by any national space programme, and the Long March 7A explosion on August 10 became the country’s fourth launch failure in 56 attempts.
Three prior failures preceded the Long March 7A loss in 2026: a Long March 3B failure in January, the debut failure of the Ceres-2 solid rocket in January, and the debut failure of the Tianlong-3 rocket in April. Each was contained within a specific vehicle and programme. The Long March 7A failure is different in scale because the suspected involvement of the YF-100 engine links it to a much wider portion of the CASC launch manifest.
The grounding arithmetic is significant. If the YF-100 investigation results in even a partial grounding of the Long March 5, 7, 7A, 6, and 8 families simultaneously, the vehicles that collectively carry the majority of CASC’s planned 2026 missions are unavailable at the same time. A 2020-style one-year grounding of the Long March 7A alone removes China’s primary geostationary satellite launcher for the rest of 2026 and most of 2027. The Long March 7A is the only vehicle in China’s active fleet purpose-built for the 5.5 to 14 tonne GTO payload range; no substitute carries the same capacity to the same orbit without the Long March 5, which is itself under investigation.
Where China’s Launch Programme Stands After Long March 7A: Satellite Destroyed, Engine Under Investigation, Moon Mission Waiting
The Long March 7A explosion on August 10, 2026 is a single event with four interlocking consequences: a military communications satellite confirmed lost with no debris recovery, a mandatory investigation into the engine shared across China’s entire modern rocket fleet, a lunar south pole mission weeks from its launch window now waiting on that investigation to clear, and a record-breaking 2026 launch programme that cannot reach its target if the fleet-wide YF-100 review produces even a partial grounding. Whether the investigation resolves in weeks or months will determine how much of this damage is short-term and how much reshapes China’s near-term space programme. Universalnest.com continues tracking this story across its Space Technology and AI News coverage.
Frequently Asked Questions
What caused the Long March 7A to explode on August 10, 2026?
The official cause is under investigation. Xinhua described it as “an anomaly during flight.” The explosion at 85 seconds occurred during Max-Q and the joint burn of the first stage and four boosters, all YF-100-powered, placing the YF-100 engine under mandatory investigation as the suspected anomaly source.
What is the Long March 7A rocket and who operates it?
The Long March 7A is a three-stage, medium-lift launch vehicle operated by CASC. Standing 60.1 metres tall, it delivers up to 7,000 kilograms to geostationary transfer orbit and 12,000 kilograms to low Earth orbit. It is China’s primary vehicle for government geostationary satellite missions, both civil and military.
What was ChinaSat-4B and why does its loss matter?
ChinaSat-4B was a geostationary communications satellite intended to provide radio, television, and telecommunications services globally. Its low Zhongxing designation indicates a likely military communications role. The total loss, confirmed by Jonathan McDowell, means no satellite or debris reached orbit and no recovery of the payload is possible.
Which other Chinese rockets use the YF-100 engine?
The YF-100 powers the Long March 5, 6, 7, 7A, and 8 families, which constitute China’s entire modern medium and heavy-lift fleet. The mandatory investigation triggered by the August 10 explosion could affect any mission depending on these vehicles until the root cause is confirmed and all engines are cleared.
How does the 2026 explosion compare to the 2020 Long March 7A failure?
The 2020 debut failure was caused by LOX cavitation in the booster feed line and grounded the 7A for approximately one year. The 2026 failure is more consequential because the YF-100 investigation now implicates every Long March family sharing the engine, not just the 7A itself.
What is Chang’e 7 and why does the Long March 7A explosion threaten it?
Chang’e 7 is China’s robotic mission to the Moon’s south pole, combining an orbiter, lander, rover, and hopping probe to search for water ice. Its Long March 5 carrier rocket uses YF-100 engines in its boosters. Both the rocket and spacecraft were at Wenchang for a late August launch when the explosion triggered the investigation.
What would confirmed water ice at the Moon’s south pole mean?
Water ice at the lunar south pole can be split through electrolysis into hydrogen and oxygen, providing rocket propellant and breathable air for crewed missions. Confirming its presence at Shackleton crater’s permanently shadowed interior would mark a defining step in establishing a sustainable human presence on the Moon.
Will China still reach its 2026 target of 140 orbital launches?
The 140-launch target was already demanding at 52% above 2025’s total. The August 10 failure was China’s fourth of the year in 56 attempts. If the YF-100 investigation grounds multiple Long March families for months, the majority of CASC’s planned 2026 manifest is affected, making the 140-launch figure structurally unreachable in 2026.
