Within Contrails
Why Some Fireballs Are Really Jet Trails
Low-angle sunlight can turn a short aircraft contrail into a red-orange streak that looks like a meteor or burning object.
On this page
- How sunlight reaches high contrails after ground sunset
- Visual clues that separate contrails from meteors
- Common camera mistakes that make trails look solid
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Introduction
One of the most dramatic yet ordinary causes of UFO and “mystery fireball” reports occurs during twilight, when a high-altitude aircraft leaves a contrail that remains brightly illuminated by the Sun even though observers on the ground are already in shadow. The result can be startling: a short red-orange streak that appears to be a flaming object, a meteor, a missile, or an unknown craft crossing the sky. In many cases, the aircraft itself is barely visible, while the glowing contrail dominates the scene and creates the illusion of a burning body. This effect is especially common around sunset and sunrise, when the geometry of sunlight and atmospheric perspective is most deceptive. [NASA Earthdata]earthdata.nasa.govtrail contrailsNASA EarthdataOn the Trail of Contrailsby L Naranjo · 2020 — Contrails are the linear clouds etched across the skies by high-altitude air… 2amsmeteors.org
How Sunlight Reaches High Contrails After Ground Sunset
The key mechanism is altitude. Commercial aircraft typically cruise high enough that they can remain in direct sunlight after the Sun has set for people on the ground. Contrails form when water vapour from aircraft exhaust freezes into countless ice crystals in very cold upper-air conditions. Those ice crystals act as tiny reflectors, catching sunlight that no longer reaches lower elevations. [NASA Earthdata]earthdata.nasa.govtrail contrailsNASA EarthdataOn the Trail of Contrailsby L Naranjo · 2020 — Contrails are the linear clouds etched across the skies by high-altitude air… [National]nasa.govNASANational Aeronautics and Space Administration. NASA explores the unknown in air and space, innovates for the benefit of humanity, and…
At twilight, sunlight must travel through a much greater thickness of atmosphere before reaching the aircraft. Shorter blue wavelengths are scattered away, leaving predominantly red, orange, and gold light. A normally white contrail can therefore take on fiery colours that resemble a burning object. The effect is often strongest when the aircraft is near the horizon, where perspective compresses the visible trail into a shorter, brighter shape. [amsmeteors.org]amsmeteors.orgitude airplanes. At sunset and sunrise, the…Read more… [NASA]earthdata.nasa.govtrail contrailsNASA EarthdataOn the Trail of Contrailsby L Naranjo · 2020 — Contrails are the linear clouds etched across the skies by high-altitude air…
Observers frequently assume they are seeing an object producing light of its own. In reality, the brightness comes from reflected sunlight. Because the ice crystals in the contrail can remain uniformly illuminated, the entire trail may glow with a steady intensity that looks surprisingly solid. [NASA]nasa.govNASAAirspace: ContrailsWhen light runs into the cloud or contrail, it is reflected by the water molecules, making the cloud visible and d…
Why the Trail Often Looks Like a Fireball Instead of a Plane
Several visual effects combine to hide the ordinary explanation.
First, the aircraft itself may be too distant to resolve. At cruising altitude, a jet can be only a tiny point of light or completely invisible against the darkening sky. The observer’s attention naturally focuses on the glowing trail. [NASA Earthdata]earthdata.nasa.govtrail contrailsNASA EarthdataOn the Trail of Contrailsby L Naranjo · 2020 — Contrails are the linear clouds etched across the skies by high-altitude air…
Second, perspective can make a long horizontal contrail appear short and concentrated. If the aircraft is travelling partly toward or away from the observer, the trail is viewed end-on rather than side-on. This compresses its apparent length and creates the impression of a compact glowing object with a tail. Similar perspective effects are well known in reports of apparent vertical objects or “rising missiles” that later prove to be ordinary aircraft contrails. [Wikipedia]WikipediaOpen source on wikipedia.org.
Third, atmospheric haze near the horizon softens edges and spreads bright light. A glowing contrail may therefore resemble a ball of flame rather than a cloud of ice crystals. The reddish colour further reinforces the impression of combustion. [amsmeteors.org]amsmeteors.orgitude airplanes. At sunset and sunrise, the…Read more…
Visual Clues That Separate Contrails from Meteors
Twilight contrails and genuine fireballs can both appear bright and dramatic, but they behave differently.
Duration: Most meteors and fireballs cross the sky in seconds. A sunlit contrail can remain visible for many minutes and may even persist longer if atmospheric conditions favour contrail survival. [GLOBE.gov]globe.govThe Science of ContrailsClouds ProtocolThe ice particles that do form quickly return again to a vapor state. Persistent (non-spreading) contrails look like long…
Motion: Meteors usually show obvious rapid movement. A distant aircraft near the horizon may appear almost stationary, particularly when travelling toward or away from the observer. [Wikipedia]WikipediaTwilight phenomenonTwilight phenomenonThe phenomenon typically occurs with launches that take place either 30 to 60 minutes before sunrise or after sunse…
Shape: Fireballs often change brightness rapidly and may fragment. Contrails generally maintain a smoother, more uniform appearance, with the brightest region remaining attached to one end of the trail. [amsmeteors.org]amsmeteors.orgFireball or Contrail?American Meteor SocietyContrails are the linear clouds etched across the skies by high-altitude airplanes. At sunset and sunrise, the sun…
Evolution: A meteor trail normally disperses differently from a contrail. Contrails may broaden, twist, or drift with upper-level winds while remaining recognisably cloud-like. [GLOBE.gov]globe.govThe Science of ContrailsClouds ProtocolThe ice particles that do form quickly return again to a vapor state. Persistent (non-spreading) contrails look like long… [NASA Science]science.nasa.govNASA ScienceAircraft ContrailsThe crisscrossing white lines are contrails that form from planes flying in different directions at differe…
The American Meteor Society specifically notes that sunrise and sunset lighting can colour contrails red, orange, and yellow, causing observers to mistake them for astronomical events. [amsmeteors.org]amsmeteors.orgFireball or Contrail?American Meteor SocietyContrails are the linear clouds etched across the skies by high-altitude airplanes. At sunset and sunrise, the sun…
Common Camera Mistakes That Make Trails Look Solid
Many of the most convincing “fireball” photographs are products of ordinary camera limitations.
Digital Zoom and Loss of Detail
Smartphone zoom often enlarges a tiny bright feature until it becomes a fuzzy blob. Fine structure within the contrail disappears, leaving what looks like a glowing solid object. The aircraft itself may vanish entirely into a bright pixel cluster. This can transform a recognisable jet-and-trail combination into something seemingly exotic.
Overexposure at Twilight
Cameras frequently expose for the darker sky rather than the bright trail. The illuminated contrail then becomes saturated and featureless, appearing brighter and thicker than it really is. Orange and red colours can become exaggerated as the camera attempts to compensate for low light.
Autofocus Errors
Low-light conditions make autofocus systems struggle. A slightly out-of-focus contrail can look like a luminous cigar, orb, or flame. Small points of light can expand into large glowing shapes through optical blur alone.
Compression and Online Sharing
Images shared through social media are often heavily compressed. Subtle cloud textures that would reveal a contrail may disappear, leaving only a bright streak against a dark background.
Real-World Fireball Reports Explained by Contrails
Reports of apparent fireballs later identified as aircraft contrails appear regularly in local news and online UFO discussions. A filmed “fireball” over Perth, Australia, in 2018 was ultimately attributed to a jet contrail illuminated by low-angle sunlight. Witnesses described an orange object streaking across the evening sky, closely matching the classic twilight-contrail appearance. [The West Australian]thewest.com.auThe West AustralianAircraft contrail causes mysterious 'fireball' filmed in Perth sky19 Sept 2018 — What looked like a meteorite turned o…
Similar cases recur across social media, astronomy forums, and meteor-reporting communities. Observers commonly report a bright orange object with a tail shortly after sunset, only for flight tracking, photographs from different angles, or subsequent analysis to reveal a high-altitude aircraft. [Facebook]facebook.comDid you see it?A look at one of the potential fireballs…When it passed over Austin, the contrails started to look like a fireball because of the suns… [Reddit]reddit.comRedditSaw it in the sky early in the morning, what could it be?The object in the image is likely a high-altitude aircraft contrail or vap… [Reddit]reddit.comRedditSome photo examples showing contrails similar to one of…The difference is that the dark contrail is a silhouette created due to…
Within the broader category of UFO reports, twilight contrails are significant because they generate sightings that feel unusually dramatic and convincing. The witness is not simply seeing an aircraft. They are seeing a familiar object under highly unfamiliar lighting conditions, where colour, perspective, altitude, and camera limitations combine to create the appearance of a fiery object moving through the sky. [NASA Earthdata]earthdata.nasa.govtrail contrailsNASA EarthdataOn the Trail of Contrailsby L Naranjo · 2020 — Contrails are the linear clouds etched across the skies by high-altitude air… 2amsmeteors.org
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Endnotes
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Source: earthdata.nasa.gov
Title: trail contrails
Link: https://www.earthdata.nasa.gov/news/feature-articles/trail-contrailsSource snippet
NASA EarthdataOn the Trail of Contrailsby L Naranjo · 2020 — Contrails are the linear clouds etched across the skies by high-altitude air...
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Source: amsmeteors.org
Link: https://www.amsmeteors.org/fireballs/fireball-or-contrail/Source snippet
itude airplanes. At sunset and sunrise, the...Read more...
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Source: nasa.gov
Link: https://www.nasa.gov/wp-content/uploads/2023/06/contrails-k-12.pdfSource snippet
NASAAirspace: ContrailsWhen light runs into the cloud or contrail, it is reflected by the water molecules, making the cloud visible and d...
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Source: science.nasa.gov
Link: https://science.nasa.gov/earth/earth-observatory/aircraft-contrails-4435/Source snippet
NASA ScienceAircraft ContrailsThe crisscrossing white lines are contrails that form from planes flying in different directions at differe...
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Source: Wikipedia
Link: https://en.wikipedia.org/wiki/Contrail -
Source: globe.gov
Title: The Science of Contrails
Link: https://www.globe.gov/web/s-cool/home/observation-and-reporting/contrails/the-science-of-contrailsSource snippet
Clouds ProtocolThe ice particles that do form quickly return again to a vapor state. Persistent (non-spreading) contrails look like long...
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Source: science.nasa.gov
Title: the evolution of a contrail 78154
Link: https://science.nasa.gov/earth/earth-observatory/the-evolution-of-a-contrail-78154/Source snippet
NASA ScienceThe Evolution of a ContrailJun 2, 2012 — Moist air can cause contrails to spread and become sprawling cirrus clouds. Are ther...
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Source: reddit.com
Link: https://www.reddit.com/r/whatisit/comments/1pvch37/saw_it_in_the_sky_early_in_the_morning_what_could/Source snippet
RedditSaw it in the sky early in the morning, what could it be?The object in the image is likely a high-altitude aircraft contrail or vap...
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Source: reddit.com
Link: https://www.reddit.com/r/UFOs/comments/114webn/some_photo_examples_showing_contrails_similar_to/Source snippet
RedditSome photo examples showing contrails similar to one of...The difference is that the dark contrail is a silhouette created due to...
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Source: facebook.com
Title: Did you see it?
Link: https://www.facebook.com/NickBanninWX/posts/did-you-see-it-a-look-at-one-of-the-potential-fireballs-showing-up-between-giddi/1384307600181258/Source snippet
A look at one of the potential fireballs...When it passed over Austin, the contrails started to look like a fireball because of the suns...
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Source: nasa.gov
Link: https://www.nasa.gov/Source snippet
NASANational Aeronautics and Space Administration. NASA explores the unknown in air and space, innovates for the benefit of humanity, and...
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Source: ntrs.nasa.gov
Title: SeasonalityPaperFormatted 110424
Link: https://ntrs.nasa.gov/api/citations/20240011983/downloads/SeasonalityPaperFormatted_110424.pdfSource snippet
and Geographical Trends on Contrail Persistent...by J Park · 2024 — At higher altitudes, the temperature remains cold enough for contrai...
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Source: www-pm.larc.nasa.gov
Link: https://www-pm.larc.nasa.gov/site/doc-library/208-Minnis.CONTRAILS.Ed2.pdfSource snippet
nasa.gov1 Contrails MS 36 Patrick Minnis Submitted to...In the tropics, the altitude for contrails is generally above 11 km year round...
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Source: reddit.com
Link: https://www.reddit.com/r/Planes/comments/1lddvvi/bright_object_with_contrail_in_evening_sky/Source snippet
ust behind the horizon. It's dark enough for bright things to be very...
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Source: facebook.com
Link: https://www.facebook.com/pjdaddyofficial/posts/ever-looked-up-and-seen-a-jet-leaving-a-long-white-trail-across-the-sky-those-ar/1159827732837949/Source snippet
trails, short for condensation trails. They form when jet...Read more...
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Source: facebook.com
Link: https://www.facebook.com/TravisABC13/posts/ive-fielded-several-reports-over-the-last-24-hours-after-the-meteor-explosion-of/1482864196541516/Source snippet
l is a meteor that catches on fire and burns up as it falls.Read more...
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Source: facebook.com
Link: https://www.facebook.com/WIONews/videos/a-record-breaking-month-of-fireball-sightings-has-left-scientists-searching-for-/1321599653204064/Source snippet
Well March delivered an...
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Source: facebook.com
Title: SK Y FULL OF FALLING FIRE
Link: https://www.facebook.com/Astronature1/posts/sky-full-of-falling-fire-but-its-not-meteorsthose-streaks-look-like-a-meteor-sho/122145470054966798/Source snippet
BUT IT'S NOT METEORS...This could be the fiery exhaust of a high-altitude aircraft or a falling piece of space debris, its contrail illu...
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Source: facebook.com
Link: https://www.facebook.com/MikeCollierWx/posts/update-this-was-a-plane-with-a-contrail-and-the-sunset-was-able-to-create-this-o/871110741032864/Source snippet
Update: this was a plane with a contrail and the sunset...This airplane's contrail looks like something falling to earth against the ear...
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Source: Wikipedia
Title: Twilight phenomenon
Link: https://en.wikipedia.org/wiki/Twilight_phenomenonSource snippet
Twilight phenomenonThe phenomenon typically occurs with launches that take place either 30 to 60 minutes before sunrise or after sunse...
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Source: faa.gov
Link: https://www.faa.gov/contrailsSource snippet
Federal Aviation AdministrationJul 21, 2025 — Contrails will not form if the air at the aircraft altitude is too warm or too dry. Note th...
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Source: nationalacademies.org
Link: https://www.nationalacademies.org/read/29073/chapter/2Source snippet
Developing a Research Agenda on Contrails and Their...Contrails form when the cooling aircraft engine exhaust plume becomes supersaturat...
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Source: thewest.com.au
Link: https://thewest.com.au/news/offbeat/aircraft-contrail-causes-mysterious-fireball-filmed-in-perth-sky-ng-b88965725zSource snippet
The West AustralianAircraft contrail causes mysterious 'fireball' filmed in Perth sky19 Sept 2018 — What looked like a meteorite turned o...
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Source: nationalacademies.org
Title: are contrails harmful to the environment
Link: https://www.nationalacademies.org/news/are-contrails-harmful-to-the-environmentSource snippet
Contrails form when hot, humid air from aircraft engines mixes with cold air at high altitudes, condensing...Read more...
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Source: space.com
Title: NAS A is updating its Artemis moon base plan. You can find out how on May 26
Link: https://www.space.com/astronomy/moon/watch-live-nasa-updating-its-moon-base-plans-on-may-26 -
Source: space.com
Link: https://www.space.com/stargazing/meteor-showers/fireball-sightings-are-surging-across-the-us-heres-whats-really-going-onSource snippet
Fireball sightings are surging across the US27 Mar 2026 — Why are fireball sightings increasing across the US? Experts explain the recent...
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Source: space.com
Title: what are contrails
Link: https://www.space.com/what-are-contrailsSource snippet
Contrails — What are they and how do they form?Aug 27, 2023 — Contrails, or condensation trails, are essentially human-made clouds; they...
Additional References
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Source: nepis.epa.gov
Link: https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=00000LVU.TXTSource snippet
EPA NepisAircraft Contrails FactsheetDepending on the temperature and the amount of moisture in the air at the aircraft altitude, con- tr...
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Source: cloudynights.com
Link: https://www.cloudynights.com/forums/topic/820496-do-short-contrail-tails-behind-high-altitude-jet-aircraft-indicate-sky-stability-and-good-seeing/Source snippet
No, but persistent contrails can tell you something about turbulence at high altitudes, which often translates into poor seeing. Breaks i...
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Source: pbs.org
Link: https://www.pbs.org/wgbh/nova/sun/contrail.htmlSource snippet
NOVA | Dimming the Sun | The Contrail EffectContrails by the hundreds can spread into man-made cirrus clouds that can both block sunlight...
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Source: alamy.com
Link: https://www.alamy.com/stock-photo/night-sky-contrails.htmlSource snippet
Night sky contrails hi-res stock photography and imagesFind the perfect night sky contrails stock photo, image, vector, illustration or 3...
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Source: universetoday.com
Link: https://www.universetoday.com/articles/is-this-a-video-of-a-huge-fireball-over-texasSource snippet
Universe TodayIs This a Video of a Huge Fireball Over Texas?10 Apr 2012 — It appears to be an airplane contrail, illuminated by sunlight...
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Source: instagram.com
Title: Due to its brightness and multiple explosions observed
Link: https://www.instagram.com/reel/DXxR6LBjSWc/?hl=enSource snippet
A bright fireball was spotted streaking through the sky over...Witnesses described it as a sudden, bright flash of light with some repor...
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Source: wral.com
Link: https://www.wral.com/news/local/spacex-launch-visibile-may-2026/Source snippet
Scientists refer to it as a twilight phenomenon, but it...Read more...
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Source: community.infiniteflight.com
Title: contrails sometimes there and sometimes not
Link: https://community.infiniteflight.com/t/contrails-sometimes-there-and-sometimes-not/463142Source snippet
Sometimes there, and sometimes notJul 10, 2020 — Contrails that disappear rather quickly indicate areas of moist air. In other words, the...
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Source: insightobservatory.com
Title: the great fireball of 1966
Link: https://www.insightobservatory.com/2014/07/the-great-fireball-of-1966.htmlSource snippet
7 Jul 2014 — It had a long, even, white train of smoke trailing behind it, much like a thick contrail, which crossed the entire length of...
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Source: globalnews.ca
Link: https://globalnews.ca/news/9121580/calgary-mysterious-object-in-sky-explained/Source snippet
'Super weird': Mysterious object in sky over Calgary...11 Sept 2022 — Foret said what looked like a fireball was actually an aircraft su...
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