Within Unresolved Cases
Why Sky Witnesses Disagree So Often
Distance, speed, size and silence can all be misjudged in open sky, turning ordinary objects into unresolved reports.
On this page
- Why open sky distorts size and distance
- How inferred speed becomes a case problem
- When multiple witnesses help or hurt
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Introduction
Many UFO cases remain unresolved for a surprisingly ordinary reason: investigators cannot reliably determine how far away an observed object was, how large it was, or how fast it was moving. In open sky, people often have few visual reference points. A light, aircraft, balloon, satellite or drone can appear dramatically different depending on viewing angle, lighting conditions and observer movement. When those basic estimates remain uncertain, investigators may be unable to confirm or eliminate conventional explanations, leaving a case open even when nothing extraordinary is required. This problem has been recognised in both historical UFO investigations and modern UAP reviews, which repeatedly emphasise that limited observational data makes definitive identification difficult. [Defense Logistics Agency]esd.whs.milDefense Logistics AgencyProject Blue BookSeptember 25, 2012 — The Air Force groups its evaluations of UFO reports under three general hea… [NASA Science]science.nasa.govNASA ScienceIndependent Study Team ReportThe study of Unidentified Anomalous Phenomena (UAP) presents a unique scientific opportunity tha…
Why Open Sky Distorts Size and Distance
Human beings are generally good at judging the size and distance of familiar objects on the ground because buildings, trees, roads and terrain provide reference points. In the sky, many of those cues disappear.
A bright light against a dark background can seem much closer or much larger than it really is. At night, even trained pilots encounter visual illusions because distance becomes difficult to judge when there are few intervening landmarks. The U.S. Federal Aviation Administration specifically warns that limited lighting and a lack of reference points can make distance estimates deceptive. [Federal Aviation Administration]faa.gov12 afh ch11Distance may be deceptive at night due to limited lighting conditions. A lack of intervening references on the ground…Read more…
This creates a chain reaction in UFO reporting:
- If a witness believes an object is nearby when it is actually distant, its apparent size becomes inflated.
- If the object is assumed to be large, its apparent behaviour may seem more unusual.
- If the distance estimate is wrong, every later calculation based on that estimate is also wrong.
A small drone a few hundred metres away and a large aircraft several kilometres away can occupy similar portions of the observer’s field of view. Without independent measurements, distinguishing between them can be difficult.
Modern UAP analysts have highlighted the same issue. The U.S. All-domain Anomaly Resolution Office (AARO) notes that forced perspective and range-estimation errors can cause observers to misinterpret an object’s size, distance and behaviour. [AARO]aaro.milAAROEffect of Forced Perspective and Parallax View on UAP…May 8, 2024 — This paper provides a basic overview of these phenomena and th…
How Inferred Speed Becomes a Case Problem
Witnesses rarely measure speed directly. Instead, they infer it from how quickly an object appears to move across the sky.
That inference depends heavily on distance.
Imagine two objects crossing the same angle of sky in ten seconds:
- A nearby bird may be moving relatively slowly.
- A distant aircraft may be moving much faster.
- A satellite hundreds of kilometres away may appear to drift even though it is travelling at orbital velocity.
If the observer guesses the wrong distance, the calculated speed can become wildly inaccurate.
Parallax and Apparent Motion
One of the most important mechanisms behind reported extreme UFO speeds is parallax. When an observer is moving—especially in an aircraft—nearby and distant objects shift against the background at different rates. This can create the impression that an object is accelerating, pacing an aircraft or making sudden directional changes.
AARO’s analysis explains that observers moving rapidly relative to an object may incorrectly interpret apparent motion as extraordinary speed. Forced perspective and parallax together can produce reports of manoeuvres that seem physically remarkable even when the observed object is ordinary. [AARO]aaro.milAAROEffect of Forced Perspective and Parallax View on UAP…May 8, 2024 — This paper provides a basic overview of these phenomena and th…
Why Investigators Cannot Simply Recalculate
Investigators often face a frustrating limitation: they cannot reconstruct speed accurately without a trustworthy range estimate.
A witness may report:
“It crossed half the sky in seconds.”
But unless investigators know the object’s actual distance, that statement does not yield a reliable velocity. The same observation can support multiple explanations.
As a result, a report may remain unresolved not because the movement was impossible, but because the available information does not permit a confident calculation.
When Multiple Witnesses Help or Hurt
People often assume that several witnesses automatically make a UFO report more reliable. Multiple observers can indeed strengthen a case, but they do not eliminate estimation problems.
When Witnesses Help
Independent observers viewing the same event from different locations can provide valuable triangulation. If investigators know where each witness stood and exactly when observations occurred, they may be able to estimate range and altitude more accurately than with a single report.
This is one reason modern scientific approaches emphasise multiple observation points and multiple sensor types. NASA’s UAP study highlighted the need for better-quality observations and multiple measurements because single observations frequently leave critical questions unanswered. [NASA Science]science.nasa.govNASA ScienceIndependent Study Team ReportThe study of Unidentified Anomalous Phenomena (UAP) presents a unique scientific opportunity tha…
When Witnesses Increase Uncertainty
Witnesses often agree that they saw something unusual while disagreeing on key details.
Different observers may report:
- Different sizes.
- Different speeds.
- Different colours.
- Different flight paths.
- Different durations.
These disagreements are not necessarily signs of dishonesty. Human perception varies according to viewing angle, expectation, lighting and attention. Research on eyewitness perception has repeatedly shown that memory and interpretation can change after an event, especially when observers discuss what they saw. [Psychology Today]psychologytoday.compsychology and the flying saucer peopleMore from Psychology Today. Forensic Psychology. 3 Min…Read more…
For investigators, conflicting descriptions can make an identification harder rather than easier.
Why Credible Witnesses Still Make Estimation Errors
A common misconception is that estimation errors only affect inexperienced observers. Historical UFO investigations and modern UAP reviews show otherwise.
Pilots, military personnel and other trained observers may be highly reliable in reporting that they saw something unusual. However, even skilled observers can struggle to estimate distance, size and speed when viewing unfamiliar objects against featureless sky. Human visual limitations do not disappear with expertise. Aviation research has long documented problems involving night vision, depth perception, altitude estimation and motion perception under challenging conditions. [Federal Aviation Administration]faa.gov12 afh ch11Distance may be deceptive at night due to limited lighting conditions. A lack of intervening references on the ground…Read more… ResearchGate This distinction is important. A credible witness can accurately describe what they perceived while still being mistaken about what produced [researchgate.net]researchgate.netPDF) The Human Factors of Night Vision Goggles…The key human factors in NVG use are visual and cognitive performance (visual acuity a… that perception.
Why These Cases Stay Open
Many unresolved UFO reports sit in a middle ground between identification and mystery. Investigators may suspect a balloon, aircraft, satellite, astronomical object or drone, yet lack enough information to prove the explanation.
Project Blue Book repeatedly noted that ordinary objects were often reported as UFOs and distinguished between identified cases, cases with insufficient data and truly unidentified reports. [Defense Logistics Agency]esd.whs.milDefense Logistics AgencyProject Blue BookSeptember 25, 2012 — The Air Force groups its evaluations of UFO reports under three general hea…
Witness estimates play a central role in that uncertainty. If distance is unknown, size becomes uncertain. If size is uncertain, speed calculations become uncertain. If speed is uncertain, extraordinary manoeuvres may be impossible to verify or dismiss. The result is a report that remains unresolved not because investigators have confirmed something extraordinary, but because the most important measurements were never available in the first place. [AARO]aaro.milAAROEffect of Forced Perspective and Parallax View on UAP…May 8, 2024 — This paper provides a basic overview of these phenomena and th… [NASA Science]science.nasa.govNASA ScienceIndependent Study Team ReportThe study of Unidentified Anomalous Phenomena (UAP) presents a unique scientific opportunity tha…
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Endnotes
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Link: https://science.nasa.gov/wp-content/uploads/2023/09/uap-independent-study-team-final-report.pdfSource snippet
NASA ScienceIndependent Study Team ReportThe study of Unidentified Anomalous Phenomena (UAP) presents a unique scientific opportunity tha...
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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...May 8, 2024 — This paper provides a basic overview of these phenomena and th...
Published: May 8, 2024
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Source: researchgate.net
Link: https://www.researchgate.net/publication/258183090_The_Human_Factors_of_Night_Vision_Goggles_Perceptual_Cognitive_and_Physical_FactorsSource snippet
(PDF) The Human Factors of Night Vision Goggles...The key human factors in NVG use are visual and cognitive performance (visual acuity a...
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Source: science.nasa.gov
Link: https://science.nasa.gov/uap/Source snippet
nasa.govUAP9 Jun 2022 — The UAP Independent Study shall report on the following questions: What types of scientific data currently collec...
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Source: researchgate.net
Link: https://www.researchgate.net/publication/395858774_Toward_a_Reliability_Scale_for_Assessing_Reports_of_Unidentified_Anomalous_Phenomena_UAPSource snippet
(PDF) Toward a Reliability Scale for Assessing Reports of...18 Sept 2025 — We categorize UAP sighting reports according to the quality o...
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Source: news.sky.com
Link: https://news.sky.com/story/nasa-ufo-report-live-scientists-to-release-unidentified-anomalous-phenomena-findings-12960933Source snippet
UFO report - live: Scientists release Unidentified...14 Sept 2023 — NASA has released a report on Unidentified Anomalous Phenomena - com...
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Source: esd.whs.mil
Link: https://www.esd.whs.mil/Portals/54/Documents/FOID/Reading%20Room/UFOsandUAPs/proj_b1.pdf?ver=2017-05-22-113513-837Source snippet
Defense Logistics AgencyProject Blue BookSeptember 25, 2012 — The Air Force groups its evaluations of UFO reports under three general hea...
Published: September 25, 2012
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Source: faa.gov
Title: 12 afh ch11
Link: https://www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/airplane_handbook/12_afh_ch11.pdfSource snippet
Distance may be deceptive at night due to limited lighting conditions. A lack of intervening references on the ground...Read more...
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Source: psychologytoday.com
Title: psychology and the flying saucer people
Link: https://www.psychologytoday.com/gb/blog/the-forensic-view/202305/psychology-and-the-flying-saucer-peopleSource snippet
More from Psychology Today. Forensic Psychology. 3 Min...Read more...
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Source: Wikipedia
Title: [Project Blue Book]({{ ‘blue-book/’ | relative_url }})
Link: https://en.wikipedia.org/wiki/Project_Blue_BookSource snippet
Project Blue BookProject Blue Book had two goals, namely, to determine if UFOs were a threat to national security, and to scientifical...
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Source: history.com
Link: https://www.history.com/articles/project-blue-bookSource snippet
Project Blue Book - Alien, Definition & Files22 Feb 2010 — Over the next 17 years, Project Blue Book would compile reports of 12,618 UFO...
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Source: archives.gov
Title: Project BLUE BOOK
Link: https://www.archives.gov/research/military/air-force/ufosSource snippet
Unidentified Flying Objects25 Jun 2024 — Pro-UFO researchers claim that an extraterrestrial spacecraft and its alien occupants were recov...
Additional References
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Guidance on Aviation Lighting Impact AssessmentThe purpose of this Guidance is to bring consistency to the assessment and illustration of...
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Source: reddit.com
Link: https://www.reddit.com/r/space/comments/16ij6ui/nasa_shares_unidentified_anomalous_phenomena/Source snippet
NASA Shares Unidentified Anomalous Phenomena...The evidence of aliens that NASA will find is going to be "We've detected animal farts on...
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Source: reddit.com
Link: https://www.reddit.com/r/nasa/comments/16ij1ym/nasa_has_released_the_unidentified_anomalous/Source snippet
NASA has released the Unidentified Anomalous...DOD and NASA now both say there are objects in the air that they can't identify. This UAP...
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Source: sky-lens.com
Link: https://sky-lens.com/guideSource snippet
Night Sky Observer's Field GuideThe human visual system is optimised for daylight pattern recognition, not for classifying faint light so...
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Source: af.mil
Link: https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104590/unidentified-flying-objects-and-air-force-project-blue-book/Source snippet
Unidentified Flying Objects and Air Force Project Blue BookOf a total of 12,618 sightings reported to Project Blue Book, 701 remained "un...
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Source: smarteye.se
Link: https://www.smarteye.se/blog/the-future-of-pilot-training-harnessing-eye-tracking-technology-for-improved-flight-safety/Source snippet
Eye Tracking in Aviation: Human Factors Research Use Case31 May 2023 — How remote eye tracking technology is revolutionizing pilot traini...
Published: May 2023
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Link: https://www.wired.com/story/nasa-ufos-aliens-report-2023Source snippet
The agency stressed the need to shift the conversation from sensationalism to science and eliminate the [stigma]({{ 'stigma/' | relative_url }}) associated with reporting...
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Source: cia.gov
Link: https://www.cia.gov/readingroom/docs/CIA-RDP81R00560R000100060001-5.pdfSource snippet
SPECIAL REPORT NO. 14. (ANALYSIS OF REPORTS OF UNIDENTIFIED AERIAL OBJECTS). PROJECT NO. 10073. 5 MAY 1955. FOR OFFICIAL USE ONLY. (AFR 1...
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NTRLHuman Factors of Night Vision Devices: Anecdotes from the...Contributing factors included inexperience, division of attention, and f...
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Source: youtube.com
Link: https://www.youtube.com/watch?v=TQcqOW39kskSource snippet
Unidentified Anomalous Phenomena Independent Study ReportNASA commissioned an independent study team to examine unidentified anomalous ph...
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