SpaceX Rocket Launch Spiral: Glowing Phenomenon Explained

On the evening of March 25, 2025, skywatchers across Europe looked up and saw something that looked like it had been ripped from a science fiction film: a glowing blue-white spiral arcing across the darkness. Social media lit up with UFO theories before physicists stepped in to explain what the crowd was really seeing—a SpaceX Falcon 9 dumping excess fuel thousands of miles away.

Date of Event: March 25, 2025 ·
Cause: SpaceX Falcon 9 rocket launch ·
Location Visible: European skies, including UK ·
Launch Site: SLC-40, Cape Canaveral ·
Phenomenon Type: Glowing blue spiral from frozen fuel

What is a SpaceX spiral?

A SpaceX spiral is an atmospheric phenomenon that occurs when excess propellant is released from a Falcon 9 rocket’s upper stage at high altitude. The venting creates a rotating cloud of frozen fuel particles that catch and scatter sunlight, producing a distinctive glowing spiral visible from hundreds or even thousands of miles away.

How does it form during rocket launches?

Planetary scientist James O’Donoghue explained the mechanics: “The spiral shape happened because the tumbling rocket was spinning as it released the fuel.” After the upper stage completes its job, it often performs a slow tumble while venting residual propellant. This rotational motion causes the expelled gases to form a spiral pattern rather than a simple cloud. At high altitudes, these gases freeze almost instantly into ice crystals that reflect sunlight, creating the bright blue-white glow that captivated European observers.

What was the spiral seen in the sky?

Reports flooded in from across the continent around 8pm local time on March 25, 2025. Observers described a luminous blue-white spiral that seemed to emerge from nothing and slowly dissipate over several minutes. The UK’s Met Office was among the first official bodies to acknowledge the event, confirming that the illuminated swirl was “likely from the Cape Canaveral launch.”

Where was it visible on March 25, 2025?

The spiral was sighted across a remarkable geographic spread. In the UK and Ireland, eyewitnesses captured videos of the glowing phenomenon at approximately 8pm local time. The spiral was particularly vivid over Croatia, where Shanghai Daily shared a timelapse showing the spiral’s gradual formation and dispersal. Weather services and social media users in Sweden, Poland, Hungary, and France also reported sightings.

What is the glowing spiral after SpaceX launch?

The blue coloration comes from sunlight scattering off the frozen fuel particles at specific angles relative to observers on the ground. The exhaust gases ejected from the Falcon 9’s upper stage freeze almost immediately in the near-vacuum of upper atmosphere, forming ice crystals that create a brilliant display when illuminated by the sun, which at that altitude remains visible even after sunset at ground level.

Why does it appear blue?

The blue-white coloring results from Rayleigh scattering—the same phenomenon that makes our sky blue. The tiny ice particles in the spiral scatter shorter blue wavelengths of sunlight more effectively than longer red wavelengths. Combined with the angle of observation and the specific altitude of the fuel release, this produces the characteristic blue-tinged glow that made the March 25 event so striking.

How long does a SpaceX spiral last?

According to reports from Space.com, the spiral appeared over Europe at around 2000 GMT and lasted a few minutes before dissipating. The exact duration depends on several factors: the amount of fuel released, atmospheric conditions at the dispersal altitude, and whether clouds obscured visibility from specific locations.

What factors affect duration?

Three primary variables determine how long a spiral remains visible. First, the quantity of propellant dumped affects the initial brightness and mass of the ice cloud. Second, upper-atmosphere winds at 70-100 km altitude can stretch and disperse the spiral, speeding dissipation. Third, the angle of sunlight determines how strongly the particles glow—visibility typically requires the sun to be just below the horizon at the release altitude while remaining above it for ground observers.

What is the spiral in the sky in Europe?

The mesmerizing blue spiral visible across European skies on March 25, 2025 was caused by a Falcon 9 upper stage performing a routine fuel dump approximately 3 hours after liftoff from Florida. The rocket, carrying the classified NROL-69 payload for the National Reconnaissance Office, had completed its primary mission before the venting occurred over Europe.

Connection to recent SpaceX launches?

Physicist Brian Cox addressed the connection directly on social media: “For everyone asking about the strange spiral shape in the sky earlier—it was associated with this launch.” The launch was mission NROL-69 for the National Reconnaissance Office, a classified payload that launched from Space Launch Complex 40 at Cape Canaveral Space Force Station at 1:48 p.m. EDT. The Falcon 9 booster successfully returned to Landing Zone 1 after stage separation.

While NROL-69’s payload details remain classified under national security protocols—standard practice for National Reconnaissance Office missions—the event highlighted how routine Falcon 9 operations can produce unexpectedly spectacular results visible across continents. The venting of excess propellant is a deliberate safety measure, not a malfunction, and poses no danger to observers on the ground. Meteo France and other weather services acted quickly to quell UFO speculation, demonstrating how scientific explanation can travel as fast as social media rumors.

Related reading: 2001 A Space Odyssey space phenomena

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