Within Stars
Why low stars can look strangely alive
Bright stars near the horizon can flicker, flash colors, and seem active because their light passes through unstable air.
On this page
- Why horizon stars shimmer more than overhead stars
- How color flashes can suggest a strange object
- Why Suffolk's night setting made the effect plausible
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Introduction
One of the strongest conventional explanations for some of the sky lights reported during the Rendlesham Forest incident is not a hidden aircraft or exotic craft, but a well-known atmospheric effect: the dramatic behaviour of bright stars seen low above the horizon. Under the right conditions, a star can appear to flash, pulse, change colour, and even seem to shift position. To observers who are already alert, concerned, and operating in darkness, those effects can make a distant point of light appear surprisingly active. Astronomers call the underlying phenomenon atmospheric scintillation, commonly known as twinkling. When combined with colour dispersion and human perception, it can transform an ordinary star into something that looks unexpectedly unusual. [Astronomy Magazine]astronomy.comsimply scintillatingAstronomy MagazineSimply Scintillating | Astronomy.com18 May 2023 — Twinkling, the common term for stellar “scintillation,” refers to tin…
Why horizon stars shimmer more than overhead stars
The familiar twinkling of stars is caused by turbulence in Earth’s atmosphere. As starlight passes through layers of air with slightly different temperatures and densities, it is continually bent by changing amounts. The result is rapid fluctuations in a star’s apparent brightness, colour, and position. Astronomers describe this as scintillation. [Astronomy Magazine+2Record]astronomy.comsimply scintillatingAstronomy MagazineSimply Scintillating | Astronomy.com18 May 2023 — Twinkling, the common term for stellar “scintillation,” refers to tin…
The effect becomes much stronger when a star is close to the horizon. A star directly overhead shines through the minimum amount of atmosphere. A star near the horizon must pass through a far thicker layer of air before reaching an observer. Every additional layer introduces more turbulence, more refraction, and more opportunities for distortion. As a result, low stars often twinkle far more dramatically than those high in the sky. [Astronomy Magazine+2The Old Farmer's Almanac]astronomy.comAstronomy MagazineWhy do some stars appear to twinkle while others don't?7 May 2026 — First, stars close to the horizon twinkle more beca…
Astronomers regularly note that bright stars near the horizon can show rapid variations in brightness and position. What appears to be motion is usually not movement of the star itself but movement of the refracted light reaching the observer. In extreme cases the star may seem to dance, jump, or pulse against the background sky. [Astronomy Magazine+2Wikipedia]astronomy.comsimply scintillatingAstronomy MagazineSimply Scintillating | Astronomy.com18 May 2023 — Twinkling, the common term for stellar “scintillation,” refers to tin…
For observers in Britain, this effect is especially noticeable with stars that never climb very high above the southern horizon. Their light is almost always travelling through a large amount of atmosphere, making them prime candidates for dramatic scintillation. [Universe Today]universetoday.comwhy does sirius twinkleUniverse TodayWhy Does Sirius Twinkle?16 Jan 2012 — Sirius appears to twinkle or shimmer more than other stars for some very simple reaso…
How colour flashes can suggest a strange object
The most striking aspect of low-altitude scintillation is often not the twinkling itself but the sudden colour changes.
White starlight contains all visible colours. When it passes through the atmosphere, refraction can separate those colours slightly, much as a prism separates sunlight. Turbulent air continually shifts the balance of colours reaching the eye. Instead of appearing steadily white, a bright star may flash red, blue, green, yellow, or white in rapid succession. [EarthSky+2Universe Today]earthsky.orgthe skys brightest star sirius before dawnSee brightest star, Sirius, in your morning sky29 Oct 2025 — Sirius appears to flash different colors when it's low in the sky. R…
Sirius, the brightest star in the night sky, is particularly famous for this behaviour. Because it is so bright, even subtle atmospheric distortions become highly visible. Observers frequently report Sirius displaying vivid colour flashes when it is low above the horizon. Astronomers and experienced skywatchers have long noted that Sirius can resemble an aircraft light or an unidentified object because of these rapidly changing colours. [Cloudy Nights+3Universe Today+3Universe Today]universetoday.comwhy does sirius twinkleUniverse TodayWhy Does Sirius Twinkle?16 Jan 2012 — Sirius appears to twinkle or shimmer more than other stars for some very simple reaso…
The effect can be surprisingly convincing. A bright object that alternates between red, green, and white may appear to have an artificial light source. If the observer does not recognise it as a star, the changing colours can create the impression of intelligent activity or mechanical operation rather than a natural astronomical object. [Cloudy Nights+2Reddit]cloudynights.comCloudy Nights Sirius ScintillationThat red and green is actually there and coming…Read more…
Importantly, these colour flashes are genuine optical effects rather than mistakes by the observer. The colours are actually present in the incoming light; what changes is the atmosphere’s handling of that light from moment to moment. [Cloudy Nights+2Universe Today]cloudynights.comCloudy Nights Sirius ScintillationThat red and green is actually there and coming…Read more…
Why Suffolk’s night setting made the effect plausible
The Rendlesham observations occurred during winter nights in coastal Suffolk. From an atmospheric perspective, that setting is noteworthy.
Cold winter air often contains strong temperature gradients and turbulent layers that can enhance scintillation. Stars viewed across long, low paths through the atmosphere are especially susceptible to these distortions. Astronomy observers commonly report the most dramatic twinkling on clear winter nights when bright stars sit low in the sky. [Astronomy Magazine+2The Old Farmer's Almanac]astronomy.comsimply scintillatingAstronomy MagazineSimply Scintillating | Astronomy.com18 May 2023 — Twinkling, the common term for stellar “scintillation,” refers to tin…
The geography of the area may also have contributed. Observers were looking across open terrain and coastal air masses rather than viewing stars high overhead. Such sightlines maximise the amount of atmosphere through which the light must travel, increasing opportunities for refraction and colour separation. The result can be a light that appears far more dynamic than casual daytime intuition would suggest. [Astronomy Magazine+2The Old Farmer's Almanac]astronomy.comAstronomy MagazineWhy do some stars appear to twinkle while others don't?7 May 2026 — First, stars close to the horizon twinkle more beca…
Darkness further removes visual reference points. Without nearby objects for comparison, the eye has little information for judging distance, speed, or size. A bright scintillating star can therefore seem much closer and more active than it really is. Atmospheric effects that would be recognised instantly by an astronomer may appear extraordinary to someone focused on a possible security incident in the middle of the night. [Astronomy Magazine+2Record]astronomy.comsimply scintillatingAstronomy MagazineSimply Scintillating | Astronomy.com18 May 2023 — Twinkling, the common term for stellar “scintillation,” refers to tin…
Why this matters to the Rendlesham star hypothesis
The star explanation associated with Rendlesham does not depend on claiming that witnesses imagined lights that were not there. Instead, it argues that real celestial objects can acquire unexpected visual properties when viewed under difficult conditions.
Astronomy writer Ian Ridpath, whose investigation became one of the best-known sceptical analyses of the case, argued that some of the “star-like” lights reported during the later stages of the incident were consistent with bright stars, particularly Sirius. He noted that bright celestial objects are among the most common causes of UFO reports and that the southern light described by Lieutenant Colonel Charles Halt corresponded closely with Sirius’s position. [Ian Ridpath]ianridpath.comHalt's memo, they were probably just that – stars. Bright celestial objects are the main culprits in…Read more…
Within that interpretation, atmospheric twinkling and colour shifts are not minor details but the core mechanism. They provide a natural explanation for why a stationary star could appear unusually bright, colourful, animated, and worthy of attention. The significance of the mechanism is that it shows how an ordinary astronomical object can acquire features that, under tense night-time conditions, resemble the behaviour people often associate with an unidentified flying object. [Ian Ridpath+2history.co.uk]ianridpath.comHalt's memo, they were probably just that – stars. Bright celestial objects are the main culprits in…Read more…
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Endnotes
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Source: astronomy.com
Title: simply scintillating
Link: https://www.astronomy.com/science/simply-scintillating/Source snippet
Astronomy MagazineSimply Scintillating | Astronomy.com18 May 2023 — Twinkling, the common term for stellar “scintillation,” refers to tin...
Published: May 2023
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Source: Wikipedia
Link: https://en.wikipedia.org/wiki/TwinklingSource snippet
TwinklingIn simple terms, twinkling of stars is caused by the passing of light through different layers of a turbulent atmosphere. Mos...
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Source: Wikipedia
Link: https://en.wikipedia.org/wiki/Astronomical_seeingSource snippet
Astronomical seeingIn astronomy, seeing is the degradation of the image of an astronomical object due to turbulence in the atmosphere...
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Source: astronomy.com
Link: https://www.astronomy.com/observing/why-do-some-stars-appear-to-twinkle-while-others-dont/Source snippet
Astronomy MagazineWhy do some stars appear to twinkle while others don't?7 May 2026 — First, stars close to the horizon twinkle more beca...
Published: May 2026
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Source: almanac.com
Link: https://www.almanac.com/why-do-stars-twinkle-and-why-planets-dontSource snippet
The Old Farmer's AlmanacWhy Do Stars Twinkle (and Why Planets Don't)?Jan 16, 2026 — Stars close to the horizon shine through a thicker la...
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Source: earthsky.org
Title: the skys brightest star sirius before dawn
Link: https://earthsky.org/tonight/the-skys-brightest-star-sirius-before-dawn/Source snippet
See brightest star, Sirius, in your morning sky29 Oct 2025 — Sirius appears to flash different colors when it's low in the sky. R...
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Source: reddit.com
Link: https://www.reddit.com/r/Damnthatsinteresting/comments/1kb6jwf/today_i_saw_sirius_a_brightest_star_in_the_night/Source snippet
by atmospheric scintillation and refraction, which affect the star's light...
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Source: Wikipedia
Title: Ian Ridpath
Link: https://en.wikipedia.org/wiki/Ian_RidpathSource snippet
Ian RidpathIan William Ridpath (born 1 May 1947) is an English science writer and broadcaster best known as a popularizer of astronomy...
Published: May 1947
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Source: history.co.uk
Link: https://www.history.co.uk/articles/what-happened-at-the-rendelsham-forest-incident-britain-s-answer-to-roswellSource snippet
Whilst it may seem the Rendlesham Forest Incident can be explained...Read more...
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Source: Wikipedia
Link: https://en.wikipedia.org/wiki/SiriusSource snippet
SiriusSirius often flashes rainbow colors in the sky due to its twinkling. Sirius can be observed in daylight with the naked eye under...
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Source: Wikipedia
Title: Rendlesham Forest incident
Link: https://en.wikipedia.org/wiki/Rendlesham_Forest_incidentSource snippet
Rendlesham Forest incidentThe Rendlesham Forest incident was a series of reported sightings of [unexplained]({{ 'unexplained/' | relative_url }}) lights near Rendlesham Fore...
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Source: reddit.com
Link: https://www.reddit.com/r/HighStrangeness/comments/m0m180/my_favorite_ufo_story_of_all_time_rendlesham/Source snippet
teries the first time I heard it in 1991, Season 4 episode 1.Read more...
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Source: reddit.com
Title: Why doesn’t everything twinkle like Sirius???
Link: https://www.reddit.com/r/Astronomy/comments/ihjjqb/why_doesnt_everything_twinkle_like_sirius/Source snippet
r/AstronomyCan I please have a scientific explanation instead of random assumptions to this? I have a Bachelors is astronomy (20 years ag...
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Source: earthsky.org
Title: flashing star autumn capella arcturus sirius
Link: https://earthsky.org/astronomy-essentials/flashing-star-autumn-capella-arcturus-sirius/Source snippet
Flashing star in autumn? Here are 3 candidates3 Oct 2024 — The bright star Capella in the constellation Auriga the Charioteer is our #1 c...
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Source: record.umich.edu
Title: Record Mystery of twinkling stars explained
Link: https://record.umich.edu/articles/mystery-of-twinkling-stars-explained/Source snippet
The beam of light from a star...Read more...
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Source: universetoday.com
Title: why does sirius twinkle
Link: https://www.universetoday.com/articles/why-does-sirius-twinkleSource snippet
Universe TodayWhy Does Sirius Twinkle?16 Jan 2012 — Sirius appears to twinkle or shimmer more than other stars for some very simple reaso...
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Source: universetoday.com
Title: sirius ufo trickster extraordinaire
Link: https://www.universetoday.com/articles/sirius-ufo-trickster-extraordinaireSource snippet
Sirius, UFO trickster extraordinaireMar 23, 2014 — When Sirius is low above the horizon, refraction (bending of light) is strong enough t...
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Source: cloudynights.com
Title: Cloudy Nights Sirius Scintillation
Link: https://www.cloudynights.com/forums/topic/990613-sirius-scintillation/Source snippet
That red and green is actually there and coming...Read more...
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Source: ianridpath.com
Link: https://www.ianridpath.com/ufo/rendlesham1b.htmlSource snippet
Halt's memo, they were probably just that – stars. Bright celestial objects are the main culprits in...Read more...
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Source: cloudynights.com
Title: 764513 about the twinkling of stars
Link: https://www.cloudynights.com/forums/topic/764513-about-the-twinkling-of-stars/Source snippet
About the twinkling of stars3 Apr 2021 — Stars at lower altitudes have their light disturbed way more, leading to all colors of the dispe...
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Source: gold.ac.uk
Link: https://www.gold.ac.uk/calendar/?id=9028Source snippet
Ian Ridpath: UFOs: Fact or fantasy?12 Jan 2016 — This hard-hitting talk by Ian Ridpath, astronomy writer and UFO sceptic, traces the grow...
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Source: ianridpath.com
Link: https://www.ianridpath.com/ufo/rendlesham1a.htmlSource snippet
Rendlesham Forest UFO explained – the original articleAccording to the story, the craft came down over the trees and landed in a blinding...
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Source: merriam-webster.com
Link: https://www.merriam-webster.com/dictionary/whySource snippet
Definition & MeaningApr 4, 2026 — 1. The cause, reason, or purpose for which know why you did it that is why you did it 2. For which: on...
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Source: atoptics.wordpress.com
Link: https://atoptics.wordpress.com/2011/10/31/sirius-scintillation/Source snippet
scintillation | Atmospheric Phenomena31 Oct 2011 — The lower a star is in the sky, the more pronounced is this effect, especially at very...
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Source: meteorwatch.org
Link: https://meteorwatch.org/sirius-twinkle/Source snippet
It is very bright, which can amplify atmospheric effects.Read more...
Additional References
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Source: facebook.com
Link: https://www.facebook.com/groups/madisonastronomicalsociety/posts/24331316033141186/Source snippet
Observing scintillation of star Sirius near horizonThat effect is due to atmospheric turbulence that bends starlight slightly and makes s...
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Source: conwayhall.org.uk
Link: https://www.conwayhall.org.uk/whats-on/event/rendlesham-deconstructing-a-myth/Source snippet
Rendlesham — Deconstructing a MythOver the past 30 years the Rendlesham Forest incident has become one of the top ten UFO cases in the wo...
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Source: instagram.com
Link: https://www.instagram.com/popular/sirius-star-colors-explained/Source snippet
Sirius Star Colors ExplainedWhen seen low on the horizon, Earth's atmosphere refracts its light, splitting it into flashing red, blue, gr...
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Source: astronomy.stackexchange.com
Title: what exactly causes color twinkling and why does it seem that any color might
Link: https://astronomy.stackexchange.com/questions/49500/what-exactly-causes-color-twinkling-and-why-does-it-seem-that-any-color-mightSource snippet
exactly causes "color twinkling" and why does it seem...Jun 4, 2022 — The underlying phenomenon is refraction through turbulent and vari...
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Source: thejournal.ie
Title: rendlesham forest incident charles halt interview 2015 2422702 Dec2015
Link: https://www.thejournal.ie/rendlesham-forest-incident-charles-halt-interview-2015-2422702-Dec2015/Source snippet
Christmas lights: The inside story of one of the world's most...24 Dec 2015 — Ian Ridpath, an astronomy writer and BBC journalist who ha...
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Source: instagram.com
Title: What you’re witnessing is an atmospheric optical illusion. As light
Link: https://www.instagram.com/reel/DTYdWyLDWLP/?hl=enSource snippet
Sirius — the brightest star visible in Earth's night sky — often...But here's the scientifically proven truth: Sirius never changes its...
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Source: theguardian.com
Title: the rendlesham forest mystery its the perfect storm of a ufo case
Link: https://www.theguardian.com/world/2026/apr/30/the-rendlesham-forest-mystery-its-the-perfect-storm-of-a-ufo-caseSource snippet
The Rendlesham Forest mystery: 'It's the perfect storm of a...30 Apr 2026 — Ian Ridpath, a British astronomer and UFO sceptic who has cr...
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Source: astronomy.stackexchange.com
Title: what is this rapidly twinkling red blue and white star i saw
Link: https://astronomy.stackexchange.com/questions/23320/what-is-this-rapidly-twinkling-red-blue-and-white-star-i-sawSource snippet
is this rapidly twinkling red, blue, and white star I saw?Oct 27, 2017 — Last night, I was on my balcony at 1AM (PST) and I looked up and...
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Source: naturalnavigator.com
Link: https://www.naturalnavigator.com/news/2023/04/the-scintillating-secrets-of-twinkling-stars/Source snippet
The Natural NavigatorThe Scintillating Secrets of Twinkling Stars5 Apr 2023 — When you look at stars at night, they appear to fluctuate i...
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Source: instagram.com
Link: https://www.instagram.com/reel/DXrh-KEhp-r/Source snippet
g changes from moment to moment — making the star's brightness and position...
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