China’s Long March 7A rocket exploded about 85 seconds after liftoff on Monday night, destroying the ChinaSat 4B communications satellite it was carrying and prompting an investigation into the cause of the launch failure.

The rocket lifted off from the Wenchang Space Launch Site on Hainan Island at 8:02 pm Beijing time. The failure occurred during the early phase of ascent, before the rocket could separate its main stage from its four strap-on boosters.

Video footage from the launch showed the rocket rising normally before a bright flash appeared, followed by a cloud of debris in the sky.

ChinaSat 4B Lost in Failure

The Long March 7A was carrying ChinaSat 4B, also known as Zhongxing-4B, a high-capacity communications satellite developed by the China Academy of Space Technology.

The satellite was operated by China Satellite Communications and was designed to provide voice, data, radio and television broadcasting services. Its planned capabilities also included communications connectivity for remote areas.

Astronomer Jonathan McDowell said the failure occurred at a relatively low altitude and velocity. As a result, the spacecraft and associated debris did not reach Earth orbit.

The loss of the satellite represents a setback for China's commercial and communications satellite deployment programme.

Second Long March 7A Failure

The incident marks the second known failure of the Long March 7A since the rocket made its debut in March 2020.

Developed by the state-owned China Aerospace Science and Technology Corporation, the liquid-fuelled Long March 7A is designed to carry payloads of up to approximately seven tonnes to geostationary transfer orbit.

The rocket had maintained a relatively strong operational record after returning to service in 2021. Its recent missions included the launch of the Tianlian-3 data relay satellite in July.

The latest failure could therefore lead to additional scrutiny of the rocket's propulsion and flight-control systems.

China Launches Investigation

China's state-run Xinhua news agency reported that authorities have begun an investigation into the failed mission.

Engineers are expected to examine telemetry, flight data and other information collected during the launch to establish what caused the rocket to break apart.

The exact cause of the failure has not yet been publicly established.

Investigators will likely focus on the sequence of events during the first 85 seconds of flight, including the performance of the rocket's engines, propulsion systems, guidance systems and structural components.

Could Tiangong Missions Face Delays?

The failure could have implications beyond the ChinaSat 4B mission because the Long March 7A shares important propulsion technology with China's standard Long March 7 rocket.

The Long March 7 is used to launch Tianzhou cargo spacecraft, which transport supplies and equipment to China's Tiangong space station.

If investigators determine that the failure was linked to a component or technology shared between the two rocket variants, engineers may need to conduct additional checks before future missions.

Such inspections could potentially affect the schedule of upcoming cargo launches to Tiangong.

However, any impact on future missions will depend on the findings of the investigation and whether the problem is determined to be specific to the Long March 7A or involves a wider system.

Setback for China’s Space Programme

China has rapidly expanded its space programme in recent years, carrying out a growing number of crewed, cargo and satellite missions.

The Long March family remains central to these activities, making launch reliability a key priority for the country's space agency and aerospace industry.

The latest incident is unlikely to alter China's broader space ambitions, but the investigation will be closely watched for indications of whether technical changes or additional checks are required across related rocket systems.

For now, authorities are focused on identifying the cause of the failure and determining whether corrective measures are necessary before the Long March 7A returns to flight.

Astronauts aboard the International Space Station (ISS) were placed on a temporary evacuation alert on Friday after a worsening air leak was detected in the Russian segment of the orbiting laboratory. As a precaution, NASA directed the crew to shelter inside their docked spacecraft and prepare for a possible emergency evacuation if conditions deteriorated.

The alert remained in place for around two hours before being lifted, after joint assessments by NASA and Russia’s space agency, Roscosmos, confirmed that repair efforts had stabilised the situation. Normal operations aboard the station were subsequently resumed.

Leak Found in Russian Module

According to Roscosmos, two leak points were identified in the transition chamber of the Zvezda service module. One of the leaks has already been sealed, while work continues on addressing the second.

The agency stated that pressure levels inside the station remain stable and within safe limits, indicating that the situation is currently under control.

International Space Station has faced recurring air leakage concerns in this module over the past several years, prompting repeated monitoring and repair efforts by both NASA and Roscosmos.

Crew Briefly Sheltered in Spacecraft

As a precaution during the alert, the four-member Crew-12 team along with an additional astronaut were instructed to enter the docked SpaceX Crew Dragon capsule and wear spacesuits in case an emergency evacuation was required.

The Crew-12 mission includes NASA astronauts Jessica Meir and Jack Hathaway, European Space Agency astronaut Sophie Adenot, and Roscosmos cosmonaut Andrey Fedyaev. NASA confirmed that the crew remained safe throughout the incident.

Recurring Technical Concern

The leak issue has been traced to the PrK transfer tunnel attached to the Zvezda module, where small cracks have been observed multiple times in recent years. Despite repeated repairs by international teams, the issue has persisted.

Reports indicate that the rate of air loss recently increased, prompting heightened safety protocols and the latest precautionary shelter order.

NASA officials have previously acknowledged that the cracks remain a closely monitored engineering concern, requiring continuous assessment to ensure crew safety.

Return to Normal Operations

After joint review by mission controllers, NASA and Roscosmos confirmed that the station’s atmosphere remained stable and there was no immediate threat to astronauts onboard. The evacuation alert was lifted, and the crew resumed their scheduled scientific and maintenance activities.