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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchTwenty Starlink satellites launched on July 11, 2024, were deployed into an orbit so low that atmospheric drag was expected to pull them back to Earth. Falcon 9 did not explode at liftoff: its first stage landed normally, while a liquid-oxygen leak disabled the second-stage engine’s planned second burn. SpaceX later linked the leak to a cracked pressure-sensor sense line.
What happened on the Starlink Group 9-3 mission?
The launch lifted off from Vandenberg Space Force Base in California on July 11, 2024. The Federal Aviation Administration (FAA) described the mishap as a failure of Falcon 9’s upper stage while the vehicle was in space, not a launch-pad or first-stage explosion. The first stage completed its planned separation and landing.
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The second stage’s Merlin Vacuum engine completed its first burn, which placed the payload on an initial trajectory. After the 20 Starlink satellites were released, the stage was supposed to perform a second burn to raise its perigee and circularize the orbit. Instead, a liquid-oxygen leak prevented that burn from being completed.
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SpaceX reported that the satellites ended up with a perigee—the lowest point of their orbit—of about 135 kilometers. At that altitude, the remaining atmosphere creates substantial drag. SpaceX said the satellites were unlikely to raise themselves quickly enough with their onboard ion thrusters and expected them to reenter and fully demise. The FAA’s July 11, 2024 incident entry and Space.com’s contemporaneous report document the event.
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Did Falcon 9 explode?
No. The available accounts do not describe an explosion during liftoff. The first stage landed as planned. The failure occurred in the second stage after satellite deployment, when its engine system could not complete the orbit-raising burn.
Video or headlines describing a “Falcon 9 explosion” can therefore be misleading. The rocket’s upper stage suffered a malfunction in space; the satellites were released, but into an orbit from which atmospheric drag was expected to bring them down.
Why did the satellites fall from orbit?
The missing second burn
Falcon 9’s two-stage mission profile uses the second stage to refine the payload’s orbit after the first stage separates. The first Merlin Vacuum burn was completed, but the second burn was interrupted by the oxygen leak. Without that maneuver, the satellites remained in an extremely low elliptical orbit instead of reaching their intended operational altitude.
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Atmospheric drag overwhelmed the recovery option
At a perigee of approximately 135 km, the satellites repeatedly passed through the upper atmosphere. Drag rapidly reduced their orbital energy. SpaceX said the satellites’ ion thrusters could not raise their orbit fast enough to overcome that drag, so the company expected atmospheric reentry and complete destruction of the spacecraft.
What caused the Falcon 9 upper-stage failure?
In its July 25, 2024 investigation update, SpaceX attributed the leak to a crack in a pressure-sensor sense line connected to the second-stage oxygen system. According to SpaceX, engine vibration produced fatigue while looseness in the line’s retaining clamp allowed conditions that contributed to the crack. The company’s statement said: “This line cracked due to fatigue caused by high loading from engine vibration and looseness in the clamp that normally constrains the line.” Space.com reproduced SpaceX’s investigation account; this is the company’s causal finding, not an independent test by this article.
SpaceX said the leak caused excessive cooling of engine components. The attempted second burn then produced a hard start that damaged engine hardware and left the upper stage without normal attitude control.
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Incident timeline
| Date or mission phase | What was reported |
|---|---|
| July 11, 2024, launch | Falcon 9 launched Starlink Group 9-3 from Vandenberg Space Force Base. |
| First-stage separation | The first stage performed its planned landing. |
| First second-stage burn | The Merlin Vacuum engine completed the initial burn. |
| After satellite deployment | A liquid-oxygen leak prevented completion of the planned second burn. |
| Payload orbit | All 20 satellites were deployed, but their perigee was about 135 km. |
| July 12, 2024 | SpaceX said drag made orbit raising unlikely and expected the satellites to reenter and fully demise. |
| July 25, 2024 | SpaceX identified the cracked sense line, vibration fatigue and clamp looseness as contributing factors. |
What did SpaceX do to prevent a repeat?
SpaceX said it would remove the failed sense line and sensor from near-term Falcon launches while testing a design change. It also planned inspections and replacement of selected sense lines and clamps. These measures were presented as corrective actions from SpaceX’s investigation.
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Were the 20 satellites dangerous?
SpaceX said the satellites would “reenter Earth’s atmosphere and fully demise” and that they “do not pose a threat to other satellites in orbit or to public safety.” That is the company’s assessment of this incident. Their very low orbit meant atmospheric reentry was expected rather than a long-lived debris population in operational orbit.
What was the FAA’s role?
The FAA oversees mishap investigations for licensed commercial space operators. Its general guidance says these investigations are intended to establish root causes and corrective actions, with the operator typically leading the investigation under FAA oversight. The FAA may authorize a return to flight before an investigation formally closes when corrective measures and public-safety risks satisfy its criteria. The FAA’s mishap guidance explains that process; it does not by itself establish Falcon 9’s current operating status.
The bottom line
The 20 Starlink satellites did not fall because Falcon 9 exploded during launch. They were released after the first stage landed normally, but a liquid-oxygen leak stopped the upper stage’s second engine burn. That left them at roughly 135 km perigee, where drag was expected to force reentry. SpaceX later traced the leak to a cracked, vibration-fatigued pressure-sensor line whose clamp had become loose.
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