Within Pilots
Why UFOs Look Faster Than They Are
A pilot can see an object honestly and still overestimate its speed when distance, wind and observer motion are unknown.
On this page
- Range, speed and angular motion
- Motion parallax from a moving cockpit
- What the Go Fast case shows
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Introduction
Many dramatic UFO reports begin with an honest observation: a pilot sees a small object or light that appears to be racing across the sky. The key problem is that speed cannot be judged accurately from appearance alone. To know how fast something is moving, an observer needs to know its distance, or range. Without range information, a slow object far away can appear extraordinarily fast, especially when viewed from a fast-moving aircraft. Studies of visual perception show that people infer speed partly from how quickly an image moves across their field of view, but that judgement depends heavily on knowing distance. When distance is uncertain, speed estimates can be badly distorted. [PubMed]pubmed.ncbi.nlm.nih.govPubMedObservers cannot accurately estimate the speed of an…To recognize that the objects' approach speed is the same despite the diffe…
This is one of the most important limits of pilot testimony in UFO cases. A pilot may accurately report what was seen, yet still overestimate the object’s speed because the geometry of the encounter is unknown. Modern analyses of several famous UAP cases have repeatedly found that apparent extreme speed can arise from ordinary objects combined with range uncertainty, observer motion and parallax. [AARO+2AARO]
Range, Speed and Angular Motion
Human observers do not directly perceive an object’s true speed. What they see is angular motion: how quickly the object appears to move across the visual field.
Imagine two aircraft crossing your view at the same apparent rate. If one is 500 metres away and the other is 20 kilometres away, their actual speeds must be radically different. The eye alone cannot solve that problem unless it has reliable distance cues. This is why aircrew, radar operators and investigators place so much value on range measurements when reconstructing encounters. [PubMed]pubmed.ncbi.nlm.nih.govPubMedObservers cannot accurately estimate the speed of an…To recognize that the objects' approach speed is the same despite the diffe…
The difficulty becomes even greater over open ocean, cloud tops or empty sky. These environments provide few visual references. A small object can appear close when it is actually distant, or distant when it is actually close. Once the estimated distance is wrong, the inferred speed becomes wrong as well. AARO’s explanation of forced perspective notes that observers can misinterpret both size and speed when range is uncertain, especially when viewing objects from far away. [AARO]aaro.milAAROEffect of Forced Perspective and Parallax View on UAP…Under these conditions, an observer can misinterpret the apparent size and s…
This helps explain why witnesses can sincerely describe an object as moving at “impossible” velocity while later analysis finds a much lower speed. The witness is usually reporting the apparent motion correctly; the error lies in the inferred distance and therefore the inferred velocity.
Motion Parallax from a Moving Cockpit
A second source of error comes from the fact that pilots observe from moving aircraft rather than from stationary platforms.
Motion parallax is the visual effect that causes nearby objects to seem to move rapidly across the background when the observer is moving. Anyone looking out of a train window sees nearby trees flash past while distant hills appear almost stationary. The same principle operates in the air. [AARO]aaro.milGo Fast Case Resolution Card Methodology FinalAAROAARO GoFast Case Resolution6 Feb 2025 — 1. AARO could not calculate a single speed or heading for the object because the aircraft's c…
From a fighter cockpit travelling hundreds of knots, even a slow-moving object can appear to streak across the landscape. The apparent motion is produced partly by the aircraft’s own movement. If the observer does not know the object’s exact range, it can be difficult to separate the object’s true motion from the motion created by the observer’s changing viewpoint. [AARO]aaro.milAAROEffect of Forced Perspective and Parallax View on UAP…Under these conditions, an observer can misinterpret the apparent size and s…
Several factors compound the effect:
- The aircraft itself is moving at high speed.
- The observed object may be moving with the wind.
- The background terrain or ocean surface is far below the object.
- The encounter often lasts only seconds.
- The pilot’s attention is divided between flying, sensors and communications.
Under those conditions, an object that is drifting slowly can appear to perform a rapid transit across the scene. AARO specifically identified parallax as a major contributor to misjudgements of apparent UAP speed in reports from fast-moving aircraft. [AARO]aaro.milGo Fast Case Resolution Card Methodology FinalAAROAARO GoFast Case Resolution6 Feb 2025 — 1. AARO could not calculate a single speed or heading for the object because the aircraft's c…
What the GoFast Case Shows
The U.S. Navy’s “GoFast” video has become one of the clearest demonstrations of how range uncertainty can create an illusion of extraordinary speed.
When the footage was first publicised, many viewers concluded that the object was skimming just above the ocean at remarkable velocity. The impression is understandable. The target seems to race over the water while aircrew react with surprise. Yet later technical analyses reached a different conclusion. [New York Post]nypost.comNew York Post Pentagon claims to debunk famous 'GOFAST' UFO radarNew York PostPentagon claims to debunk famous 'GOFAST' UFO radar…November 21, 2024 — 20 Nov 2024 — The “GOFAST” video shows a radar re…
NASA researchers and independent analysts showed that much of the apparent speed resulted from parallax generated by the F/A-18’s own motion. The object appeared far faster than it actually was because the jet was moving rapidly while viewing a distant target against the ocean background. Metabunk [PBS]pbs.orgPBS3 ways scientists use math to help debunk UFO videos24 Apr 2025 — Semeter helped analyze one particular video called "GO FAST," where…
AARO’s 2025 case-resolution analysis went further. Using the information visible on the display, analysts concluded that the object was not close to the water as many viewers assumed. Instead, it was estimated to be around 13,000 feet in altitude. AARO assessed with high confidence that the object was not travelling at anomalous speed and that its dramatic appearance was largely attributable to motion parallax. The office estimated speeds consistent with a small airborne object moving with prevailing winds rather than an extraordinary craft. [AARO]aaro.milGo Fast Case Resolution Card Methodology FinalAAROAARO GoFast Case Resolution6 Feb 2025 — 1. AARO could not calculate a single speed or heading for the object because the aircraft's c… [Reddit]reddit.com” the report states. “The object's apparent high speed is…Read more…
An important lesson from the case is that even trained observers can be influenced by visual geometry. The pilots were not necessarily wrong about what they saw. The mistake was assuming that apparent motion across the image directly represented true speed. Once distance, altitude and aircraft motion were reconstructed, the extraordinary velocity largely disappeared. AARO [PBS]pbs.orgPBS3 ways scientists use math to help debunk UFO videos24 Apr 2025 — Semeter helped analyze one particular video called "GO FAST," where…
Why This Matters for Pilot UFO Reports
Pilot reports remain valuable because they often provide the first indication that something unusual deserves investigation. However, speed estimates based solely on visual appearance are among the least reliable parts of an aerial sighting.
Without accurate range information, a witness cannot confidently determine:
- True speed.
- True size.
- True altitude.
- Whether the object is manoeuvring or merely drifting.
- Whether the apparent motion comes from the object or the observer.
That limitation does not mean pilots are poor witnesses. It means that aerial perception is constrained by geometry. A skilled pilot can accurately describe a fast-looking object and still be mistaken about its actual velocity if range, wind and observer motion are unknown. The history of UFO investigations shows that this single mechanism—misjudging speed because distance is uncertain—can transform an ordinary airborne object into something that appears extraordinary. [AARO]aaro.milGo Fast Case Resolution Card Methodology FinalAAROAARO GoFast Case Resolution6 Feb 2025 — 1. AARO could not calculate a single speed or heading for the object because the aircraft's c… [AARO]aaro.milGo Fast Case Resolution Card Methodology FinalAAROAARO GoFast Case Resolution6 Feb 2025 — 1. AARO could not calculate a single speed or heading for the object because the aircraft's c…
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Endnotes
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Source: aaro.mil
Link: https://www.aaro.mil/Portals/136/PDFs/Information%20Papers/AARO_Effect_of_Forced_Perspective_and_Parallax_View_on_UAP_Observations_2024.pdfSource snippet
AAROEffect of Forced Perspective and Parallax View on UAP...Under these conditions, an observer can misinterpret the apparent size and s...
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Source: aaro.mil
Title: Go Fast Case Resolution Card Methodology Final
Link: https://www.aaro.mil/Portals/136/PDFs/case_resolution_reports/AARO_GoFast_Case_Resolution_Card_Methodology_Final.pdfSource snippet
AAROAARO GoFast Case Resolution6 Feb 2025 — 1. AARO could not calculate a single speed or heading for the object because the aircraft's c...
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Source: pbs.org
Link: https://www.pbs.org/newshour/science/3-ways-scientists-use-math-to-help-debunk-ufo-videosSource snippet
PBS3 ways scientists use math to help debunk UFO videos24 Apr 2025 — Semeter helped analyze one particular video called "GO FAST," where...
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Source: reddit.com
Link: https://www.reddit.com/r/ufo/comments/1iooz44/pentagon_releases_aaro_report_on_go_fast_video/Source snippet
” the report states. “The object's apparent high speed is...Read more...
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Source: metabunk.org
Title: nasa panel analyzes go fast.13174
Link: https://www.metabunk.org/threads/nasa-panel-analyzes-go-fast.13174/Source snippet
MetabunkNASA panel analyzes GO FAST19 Sept 2023 — The main point of the NASA analysis is that the GO FAST object looks fast because of pa...
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Source: metabunk.org
Link: https://www.metabunk.org/threads/f-16-pilot-chris-lehtos-interpretation-of-the-gofast-footage-focus-parallax-inaccurate-range.11789/Source snippet
GoFast footage [Focus, Parallax, Inaccurate Range]... This guy is apparently a pilot/wso and is claiming Go Fast range display is not ac...
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Source: reddit.com
Link: https://www.reddit.com/r/skeptic/comments/nzmkvc/gofast_ufo_analysis_yeah_no_probably_just_a/Source snippet
GOFAST UFO Analysis (yeah no, probably just a balloon...His speed calculations closer to sea level look wrong. And you really can't esti...
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Source: reddit.com
Link: https://www.reddit.com/r/space/comments/13y32g1/nasa_panel_no_convincing_evidence_for/Source snippet
NASA panel: No convincing evidence for extraterrestrial life...He described that the object's apparent speed on the video is due to a co...
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Source: reddit.com
Link: https://www.reddit.com/r/UFOs/comments/16iix64/nasas_gofast_analysis_says_object_going_40mph/Source snippet
NASA's GoFast Analysis says object going 40mph: r/UFOsUsing the calculated true air speed (TAS) and a bit more trigonometry, we find the...
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Source: reddit.com
Link: https://www.reddit.com/r/UFOs/comments/1gv8xak/aaro_has_resolved_the_go_fast_uap/Source snippet
Wind speed at that altitude was 60 knots. Object moved in a relatively straight...Read more...
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Source: science.nasa.gov
Title: uap independent study team final report
Link: https://science.nasa.gov/wp-content/uploads/2023/09/uap-independent-study-team-final-report.pdfSource snippet
Study Team ReportThe study of Unidentified Anomalous Phenomena (UAP) presents a unique scientific opportunity that demands a rigorous, ev...
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Source: science.nasa.gov
Link: https://science.nasa.gov/uap/Source snippet
nasa.govUAP9 Jun 2022 — The study will focus on identifying available data, how best to collect future data, and how NASA can use that da...
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Source: pubmed.ncbi.nlm.nih.gov
Link: https://pubmed.ncbi.nlm.nih.gov/19146869/Source snippet
PubMedObservers cannot accurately estimate the speed of an...To recognize that the objects' approach speed is the same despite the diffe...
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Source: nypost.com
Title: New York Post Pentagon claims to debunk famous ‘GOFAST’ UFO radar
Link: https://nypost.com/2024/11/20/us-news/pentagon-claims-to-debunk-famous-gofast-ufo-radar-video/Source snippet
New York PostPentagon claims to debunk famous 'GOFAST' UFO radar...November 21, 2024 — 20 Nov 2024 — The “GOFAST” video shows a radar re...
Published: November 21, 2024
Additional References
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Source: rev.com
Link: https://www.rev.com/transcripts/nasa-holds-first-public-meeting-on-ufos-transcriptSource snippet
NASA Holds First Public Meeting on UFOs TranscriptThe UAP independent study was commissioned to create a roadmap on how to use the tools...
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Source: youtube.com
Link: https://www.youtube.com/watch?v=diPXow8zgc8Source snippet
How scientists use math to help explain UFO videosPBS News' Casey Kuhn spoke to Semeter about how he used math to explain why one widely...
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Source: alabia.com.br
Title: nasa gofast ufo analysis methodological limitations
Link: https://alabia.com.br/insights/papers/pesquisa-ciencia/nasa-gofast-ufo-analysis-methodological-limitations/Source snippet
NASA's GoFast UFO Analysis Exposed: Methodological...1 May 2026 — This restrictive analytical approach raises critical questions about t...
Published: May 2026
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Source: facebook.com
Link: https://www.facebook.com/StarTalk/posts/is-motion-parallax-the-reason-many-believe-this-to-be-a-uap-turns-out-we-can-cal/1313924630366593/Source snippet
the map, then zoom in closer, and it looks like it's moving...
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Source: universetoday.com
Link: https://www.universetoday.com/articles/report-nasa-ufo-uap-researchSource snippet
Universe TodayFollowing Up on Report, NASA Takes On a Bigger Role in...14 Sept 2023 — The report noted that many UAP reports turn out to...
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Source: space.com
Title: “We do have some very anomalous objects,” he said.Read more
Link: https://www.space.com/space-exploration/search-for-life/pentagon-ufo-chief-tells-senate-very-anomalous-objects-need-careful-study-videoSource snippet
Pentagon UFO chief tells Senate 'very anomalous objects'...19 Nov 2024 — Kosloski noted that his office does not believe that every UAP...
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Source: leonarddavid.com
Title: debunking navy ufo videos
Link: https://www.leonarddavid.com/debunking-navy-ufo-videos/Source snippet
Debunking Navy “UFO” Videos30 Apr 2020 — Lastly, the GO-FAST video probably shows a balloon, West surmises. “It's not moving fast, it's n...
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Source: startalkmedia.com
Link: https://startalkmedia.com/show/the-truth-about-uaps-with-jon-kosloski/Source snippet
The Truth About UAPs with Jon Kosloski - StarTalk Radio5 Aug 2025 — There's nothing, but with the parallax, we can assess that the object...
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Source: Wikipedia
Title: Pentagon UFO videos
Link: https://en.wikipedia.org/wiki/Pentagon_UFO_videosSource snippet
Pentagon UFO videosThe Pentagon UFO videos are selected visual recordings of Forward-looking [infrared]({{ 'infrared/' | relative_url }}) (FLIR) targeting cameras from Un...
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Source: nps.edu
Link: https://nps.edu/documents/110773463/165192597/CTX-EAG-Special-Issue-2026.pdfSource snippet
Unidentified Anomalous Phenomena: Science and Analysis14 May 2026 — parent speeds from misjudging distance or camera motion and other eff...
Published: May 2026
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