Within Common Causes
Why Rocket Launches Create Glowing UFO Spirals
High-altitude exhaust can remain sunlit after local sunset, producing luminous spirals and expanding clouds that seem detached from any rocket.
On this page
- How twilight keeps high altitude exhaust illuminated
- Why plumes expand into spirals and luminous clouds
- Clues that separate rocket effects from solid craft
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Introduction
Glowing spirals and expanding luminous clouds are among the most convincing-looking UFO reports because they often appear unlike any familiar aircraft or astronomical object. In reality, one of the best-understood causes is the exhaust plume from a high-altitude rocket stage during twilight. Long after the rocket itself has become too small to see, its exhaust can remain brightly illuminated by the Sun while observers on the ground are already in darkness. As the gases expand into the near-vacuum of the upper atmosphere, they can form vast glowing clouds or striking spiral patterns that seem detached from any visible vehicle. This combination of unusual lighting, immense apparent size and unfamiliar motion has repeatedly triggered reports of mysterious craft, even among experienced observers.[Wikipedia]WikipediaTwilight phenomenonTwilight phenomenon
How twilight keeps high-altitude exhaust illuminated
The key to the effect is geometry rather than anything unusual about the rocket itself.
Near sunrise or sunset, people on the ground stand within Earth’s shadow, but a rocket climbing tens or even hundreds of kilometres above the surface can still be illuminated directly by the Sun. Exhaust released at those altitudes contains tiny particles of water vapour, carbon dioxide and other combustion products that rapidly cool, condense and often freeze. These particles scatter sunlight extremely efficiently against an otherwise dark sky, making the plume appear brilliantly luminous.[Wikipedia]WikipediaTwilight phenomenonTwilight phenomenon
Because the illuminated exhaust is so much larger than the rocket, witnesses frequently lose sight of the vehicle entirely. What remains visible is a glowing cloud that appears to float independently across the sky, creating the impression that the light itself is the object.
The effect is largely restricted to launches occurring roughly within an hour before sunrise or after sunset. During full daylight, the sky is too bright for the plume to stand out, while in complete darkness there is no sunlight available to illuminate the exhaust.[VICE]vice.comWhy Do Some Rocket Launches Look Like UFOs?Why Do Some Rocket Launches Look Like UFOs?October 8, 2018…
Why plumes expand into spirals and luminous clouds
The dramatic shapes are a natural consequence of physics in the upper atmosphere.
At sea level, atmospheric pressure confines a rocket’s exhaust into a relatively narrow plume. At orbital altitudes, where the air is extremely thin, the same gases expand rapidly in all directions, producing enormous translucent clouds hundreds of kilometres across from the observer’s perspective. This is why photographs sometimes resemble giant jellyfish, nebulae or glowing discs rather than ordinary exhaust trails.[Astronomy Picture of the Day]apod.nasa.govAstronomy Picture of the DayAPOD: 2026 March 19 – Launch Plume: SpaceX Jellyfish…
The spiral pattern usually appears during operations involving an upper stage rather than the main ascent. Common causes include:
- Rotation of the upper stage while stabilising its orientation.
- Controlled venting or dumping of excess propellant.
- Small attitude-control thrusters releasing gas while the stage spins.
As the stage rotates, the escaping gas traces out a corkscrew. Because the exhaust continues expanding while reflecting sunlight, observers see an ever-growing luminous spiral rather than a narrow helix. The pattern often remains visible for several minutes before fading as the particles disperse.[sky.com]news.sky.comNews Glowing spiral appears in night skySky NewsGlowing spiral appears in night sky - as Met Office reveals likely cause | Science, Climate & Tech News | Sky NewsMarch 25, 2025…
Upper-level winds can further stretch or distort the plume, producing shapes that appear to pulse, blossom or change direction even though the underlying rocket follows a predictable trajectory.[Wikipedia]WikipediaTwilight phenomenonTwilight phenomenon
Why these displays are mistaken for UFOs
Rocket twilight phenomena combine several visual cues that humans naturally associate with something extraordinary.
First, the illuminated cloud can appear enormous because observers have almost no depth references against a dark sky. A distant plume hundreds of kilometres away may seem like a nearby object spanning a significant part of the horizon.
Second, the visible glow often appears to hover or drift slowly. Although the rocket is travelling at several kilometres per second, the vast viewing distance compresses its apparent motion, making it seem almost stationary.
Third, the brightest part of the display is frequently not the rocket itself but the expanding exhaust. Witnesses therefore search unsuccessfully for a solid craft producing the light, reinforcing the impression that they are observing something unknown rather than conventional spaceflight.[VICE]vice.comWhy Do Some Rocket Launches Look Like UFOs?Why Do Some Rocket Launches Look Like UFOs?October 8, 2018…
Modern examples that generated UFO reports
Rocket spirals have become more familiar as launch rates have increased, yet they continue to generate widespread speculation.
A Falcon 9 launch in March 2025 produced a striking blue-white spiral visible across much of the United Kingdom and Europe. Thousands of observers initially suggested extraterrestrial or unexplained causes before the UK’s Met Office identified the phenomenon as sunlight reflecting from a spinning Falcon 9 upper-stage exhaust plume following a fuel dump.[sky.com]news.sky.comNews Glowing spiral appears in night skySky NewsGlowing spiral appears in night sky - as Met Office reveals likely cause | Science, Climate & Tech News | Sky NewsMarch 25, 2025…
Similar displays have repeatedly followed launches from California’s Vandenberg Space Force Base. These “space jellyfish” appearances have surprised residents across the western United States because the expanding exhaust cloud becomes visible over an area vastly larger than the launch site itself. NASA’s Astronomy Picture of the Day has featured several such events as examples of the twilight phenomenon rather than unexplained aerial objects.[Astronomy Picture of the Day]apod.nasa.govAstronomy Picture of the DayAPOD: 2026 March 19 – Launch Plume: SpaceX Jellyfish…
These incidents demonstrate why even dramatic, widely photographed sky phenomena can have well-understood physical explanations without diminishing their visual impact.
Clues that separate rocket effects from solid craft
Several characteristics consistently distinguish twilight rocket plumes from reports of structured flying objects:
- Timing: They usually occur shortly after sunset or before sunrise, matching launch windows that produce twilight illumination.
- Expansion: The glowing feature steadily grows larger as the exhaust disperses rather than maintaining a fixed size.
- Diffuse appearance: Edges are soft and cloud-like instead of sharply defined.
- Colour changes: Blue, white, pink and orange hues often develop as sunlight scatters through expanding particles.
- Predictable duration: Most displays evolve over several minutes before gradually fading.
- Launch correlation: Public launch schedules and orbital tracking frequently match the time and direction of the sightings.[wikipedia.org]WikipediaTwilight phenomenonTwilight phenomenon
Unlike reports of solid craft making abrupt manoeuvres, rocket plumes follow the expected progression of an exhaust cloud dispersing under known atmospheric conditions.
Why rocket spirals matter in UFO investigations
Rocket twilight phenomena illustrate how an event can appear astonishing while remaining entirely consistent with established aerospace physics. They also show why eyewitness sincerity is not the same as identifying the underlying cause. A witness may accurately describe an immense glowing spiral or expanding cloud while naturally concluding that it represents an unknown craft because the rocket itself is invisible.
Within the broader history of UFO reports, these displays are among the strongest examples of ordinary technology producing genuinely unfamiliar appearances. Their recurrence across multiple countries and launch providers, together with their close correspondence to documented launch times and the known behaviour of high-altitude exhaust, makes them one of the clearest mechanisms by which spectacular but conventional events become enduring UFO stories.[wikipedia.org]WikipediaTwilight phenomenonTwilight phenomenon
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Endnotes
1.
Source: Wikipedia
Title: Twilight phenomenon
Link:https://en.wikipedia.org/wiki/Twilight_phenomenon
2.
Source: apod.nasa.gov
Link:https://apod.nasa.gov/apod/ap260319.html
Source snippet
Astronomy Picture of the DayAPOD: 2026 March 19 – Launch Plume: SpaceX Jellyfish...
3.
Source: vice.com
Title: Why Do Some Rocket Launches Look Like UFOs?
Link:https://www.vice.com/en/article/what-is-the-twilight-phenomenon-spacex-rocket/
Source snippet
Why Do Some Rocket Launches Look Like UFOs?October 8, 2018...
Published: October 8, 2018
4.
Source: news.sky.com
Title: News Glowing spiral appears in night sky
Link:https://news.sky.com/story/glowing-spiral-appears-in-night-sky-as-met-office-reveals-likely-cause-13335297
Source snippet
Sky NewsGlowing spiral appears in night sky - as Met Office reveals likely cause | Science, Climate & Tech News | Sky NewsMarch 25, 2025...
Published: March 25, 2025
5.
Source: apod.nasa.gov
Title: Astronomy Picture of the Day
Link:https://apod.nasa.gov/rjn/apod/ap240312.html
6.
Source: aerospace.org
Link:https://aerospace.org/article/aerospace-advances-space-technology-restartable-solid-rocket-motor-concept
7.
Source: aerospace.org
Link:https://aerospace.org/
8.
Source: theguardian.com
Link:https://www.theguardian.com/world/2025/mar/25/alien-hopes-crash-to-earth-glowing-spiral-uk-spacex-rocket
Source snippet
However, it has been determined that the phenomenon was caused by a SpaceX rocket, specifically the Falcon 9, which launched from Cape Ca...
Additional References
9.
Source: digitaltrends.com
Link:https://www.digitaltrends.com/space/spiral-in-the-sky-spacex-falcon-9/
Source snippet
Digital TrendsIt's not aliens, it's just SpaceX: scientists figure out strange spiral in the sky - Digital Trends...
10.
Source: mexc.com
Title: Mysterious Glow in the Sky?
Link:https://www.mexc.com/en-GB/news/1141507
Source snippet
Don't Call It a UFO Just Yet – The SpaceX Rocket Launch Jellyfish Effect and Spiral Phenomenon Explained | MEXC NewsJune 12, 2026 — This...
Published: June 12, 2026
11.
Source: tminuszero.app
Title: The result can be a bro
Link:https://www.tminuszero.app/jellyfish-effect
Source snippet
The Rocket Jellyfish Effect: What It Is and How to See One | T-Minus ZeroJuly 9, 2026 — THE ROCKET JELLYFISH EFFECT: WHAT IT IS AND HOW T...
Published: July 9, 2026
12.
Source: youtube.com
Title: The Norway Spiral: When a Russian Missile Test Baffled the World
Link:http://www.youtube.com/watch?v=s08W2pYgCS0
Source snippet
Mysterious 'Whirlpool' Appears In The Night Sky Above Hawaii Probably Be Leftover SpaceX Rocket Fuel...
13.
Source: youtube.com
Link:http://www.youtube.com/watch?v=CCuOvtYBL9w
Source snippet
Spiral over Norway was in fact a failed russian missile...
14.
Source: youtube.com
Title: Spiral over Norway was in fact a failed russian missile
Link:http://www.youtube.com/watch?v=Tzp2SvbO6AU
Source snippet
SpaceX rocket spiral sky UFO twilight phenomenon Incredible scene as SpaceX launch illuminates night sky...
15.
Source: youtube.com
Link:http://www.youtube.com/watch?v=Ko8FhK_3tfM
Source snippet
The Norway Spiral: When a Russian Missile Test Baffled the World...
Published: January 18, 2023
16.
Source: newspaceeconomy.ca
Link:https://newspaceeconomy.ca/2025/12/02/decoding-the-unidentified-a-comprehensive-analysis-of-uap-explanations/
17.
Source: livescience.com
Link:https://www.livescience.com/space/space-exploration/dying-spacex-rocket-triggers-giant-spiral-of-light-above-uk-and-europe-during-secret-mission
18.
Source: skyatnightmagazine.com
Link:https://www.skyatnightmagazine.com/advice/strange-flash-in-the-night-sky-explanation