Endangered Earth
Red Rain in Kerala, India
Credit: Louis and Kumar's research paper
Photomicrograph of particles from red rain sample

Red Rain in Kerala, India

From 25 July to 23 September 2001, red rain sporadically fell on the southern Indian state of Kerala. Heavy downpours occurred in which the rain was coloured red, staining clothes with an appearance similar to that of blood. Yellow, green, and black rain was also reported. Coloured rain had been reported in Kerala in as early as 1896 and several times since then.

It was initially announced that the rains were coloured by fallout from a hypothetical meteor burst, but a study commissioned by the Government of India found that the rains had been coloured by airborne spores from a locally prolific terrestrial alga. Other explanations were proposed but not until early 2006 did the coloured rains of Kerala gain widespread attention in the popular media. A controversial conjecture that the coloured particles were extraterrestrial cells was proposed by Godfrey Louis and Santhosh Kumar of the Mahatma Gandhi University in Kottayam. No information to support the extraterrestrial hypothesis has been published since 2006. - Wikipedia

Cometary panspermia explains the red rain of Kerala
Authors: Godfrey Louis, A. Santhosh Kumar
(Submitted on 5 Oct 2003)

    Abstract: Red coloured rain occurred in many places of Kerala in India during July to September 2001 due to the mixing of huge quantity of microscopic red cells in the rainwater. Considering its correlation with a meteor airbust event, this phenomenon raised an extraordinary question whether the cells are extraterrestrial. Here we show how the observed features of the red rain phenomenon can be explained by considering the fragmentation and atmospheric disintegration of a fragile cometary body that presumably contains a dense collection of red cells. Slow settling of cells in the stratosphere explains the continuation of the phenomenon for two months. The red cells under study appear to be the resting spores of an extremophilic microorganism. Possible presence of these cells in the interstellar clouds is speculated from its similarity in UV absorption with the 217.5 nm UV extinction feature of interstellar clouds. 

Comments:  20 pages, 5 figures, paper to be submitted to Nature
Subjects:  Astrophysics (astro-ph)
Cite as:  arXiv:astro-ph/0310120v1
Los Alamos Archives: Cometary panspermia explains the red rain of Kerala

Panspermia Proven?
Credit: Louis and Kumar
Red rain collected in buckets

Between July and September of 2001, a phenomenon occurred in India that, to this day, has not been positively explained. The ‘Red Rain of Kerala’ has become one of the most discussed anomalies of recent years and, for some, its occurrence proves that we are not alone in the universe.

The red rain first fell on the Kottayam and Idukki districts of Kerala on July 25th, 2001 and the downpours were most intense during the first ten days, growing less frequent over the following eight weeks. Locals were baffled by the red staining they found on their clothes and linen and buckets, pails and bowls collected more of the coloured water. Some other hues were reported, but the scarlet tint was most prevalent. Strangely, the red rain fell in very localised areas, with normal rain falling only a few metres from where the coloured water was collected.

 According to early eyewitnesses, the first red rain was preceded by a thunderclap and a bright flash in the sky. This led some to conclude that the staining was caused by dust from a high altitude meteorite burst over the region.

As the phenomenon diminished, Kerala’s red rain became just another mystery to file away. Indeed, a report from the Centre for Earth Science Studies (CESS) and the Tropical Botanical Garden and Research Institute (TBGRI) in Kerala concluded that the cause of the red rain were algal spores from local trees. The report determined that there was no volcanic, desert or meteoric dust in the rain and that no pollutants or gases had caused the odd colouring. What was not explained was why the rain fell in such localised areas, nor why the cells that were analysed contained high concentrations of aluminium and low amounts of phosphorous. Aluminium is not usually found in biological cells and phosphorous is normally found in much higher quantities.

The mystery really exploded onto the world scene in April, 2006, when Dr Godfrey Louis and his research student, A. Santhosh Kumar, published a report in the Astrophysics and Space Science journal, suggesting that the red particles were microbial, extra-terrestrial organisms. They proposed that a meteorite exploded high over Kerala, releasing in excess of 50,000kg of the alien microbes over the region. Slowly, the alien cells drifted down over the followring two months, explaining the high concentrations at the beginning of the incident that diminished over time. Unfortunately, however, no meteoric or cometary dust has been found in the samples taken from Kerala.

Tests on the cells by Louis’ team found that no DNA could be found, something unheard of in terrestrial biological organisms. Recent studies by Professor Chandra Wickramasinghe of Cardiff University have yielded positive results for DNA in the cells, but the mystery does not stop there.

Rain water sample (left) and after the particles settled (right). Dried sediment (center).

Experiments in the laboratory have shown that the cells can reproduce in water heated to nearly 600?F (300?C). All known earthly microbes are killed when heated to only 250?F (130?C).

So what do we have here? Are the cells found in the Kerala red rain terrestrial spores of a previously unknown type, that sometimes defy attempts to locate DNA in its structure, that can reproduce at temperatures that would kill any known microbe or bacteria, that contain high concentrations of aluminium and low levels of phosphorous (in direct oppositions to all earth-based life). Are the cells really only hardy algae spores that are common in Kerala, as the first official report suggested?

Or is what fell on that Indian province five years ago the first definite proof that life exists in the depths of space and sometimes finds its way to Earth?

It seems that the scientific community is divided on this one…

© Steve Johnson - 2006
(First published in Issue 4 of UFOData Magazine.)

Small bottles like the ones shown above can store a variety of liquids, from scientific water samples to homemade essential oils. Finding the perfect essential oil bottles for a specific formula can be tricky, but there is a large selection of essential oil bottles wholesale to choose from online.


Kottayam district in Kerala, which experienced the most intense red rainfall


The coloured rain of Kerala began falling on 25 July 2001, in the districts of Kottayam and Idukki in the southern part of the state. Yellow, green, and black rain was also reported. Many more occurrences of the red rain were reported over the following ten days, and then with diminishing frequency until late September. According to locals, the first coloured rain was preceded by a loud thunderclap and flash of light, and followed by groves of trees shedding shrivelled grey "burnt" leaves. Shrivelled leaves and the disappearance and sudden formation of wells were also reported around the same time in the area. It typically fell over small areas, no more than a few square kilometres in size, and was sometimes so localised that normal rain could be falling just a few metres away from the red rain. Red rainfalls typically lasted less than 20 minutes. Each millilitre of rain water contained about 9 million red particles, and each litre of rainwater was contained approximately 100 milligrams of solids. Extrapolating these figures to the total amount of red rain estimated to have fallen, it was estimated 50,000 kilograms of red particles had fallen on Kerala.

Description of the particles

The brownish-red solid separated from the red rain consisted of about 90% round red particles and the balance consisted of protozoans and debris.[5] The particles in suspension in the rain water were responsible for the colour of the rain, which at times was as strongly coloured as blood. A small percentage of particles were white or had light yellow, bluish gray and green tints.[3] The particles were typically 4 to 10 µm across and spherical or oval. Louis's images with a scanning electron microscope showed the particles as having a depressed centre, suggestive of biological cell, especially red blood cells. At still higher magnification some particles showed internal structures. - Wikipedia

Grains under a scanning electron microscope
A single grain viewed with a transmission electron microscope, 
purportedly showing a detached inner capsule. Source: CCAB, Cardiff University
Official Report

Initially the Centre for Earth Science Studies (CESS) had said that the cause of the red rain was an exploding meteor, which had dispersed about 1,000 kg (around one ton) of material. A few days later, when the red rain continued to fall, CESS retracted this. (Debris from a meteor would not have continued to fall in the same area; it would have been dispersed by winds.) CESS and the Tropical Botanical Garden and Research Institute (TBGRI) jointly issued a statement that the particles colouring the rainwater were some type of spore. Then in November of 2001, commissioned by the Government of India's Department of Science & Technology, the CESS and TBGRI released a report which concluded that:

    The colour was found to be due to the presence of a large amount of spores of a lichen-forming alga belonging to the genus Trentepohlia. Field verification showed that the region had plenty of lichens. Samples of lichen taken from Changanacherry, when cultured in an algal medium, also showed the presence of the same species of algae. Both samples (from rainwater and from trees) produced the same kind of algae, indicating that the spores seen in the rainwater could most probably have come from local sources.

Although red or orange, Trentepohlia is a Chlorophyte green alga which can grow abundantly on tree bark or damp soil and rocks, but is also the photosynthetic symbiont or photobiont of many lichens, including some of those abundant on the trees in Changanacherry area.

The report also stated that there was no dust of meteoric, volcanic, or desert origin present in the rainwater, and that the colour of the rainwater was not due to any dissolved gases or pollutants. The report concluded that heavy rains in Kerala in the weeks preceding the red rains could have caused the widespread growth of lichens, which had given rise to a large quantity of spores in the atmosphere.

However, it could find no satisfactory explanation for the apparently extraordinary dispersal, nor for the uptake of the spores into clouds. It noted, for example, that prior to the first red rainfall there had been almost continuous rain for a period of eight hours. CESS responded ‘‘While the cause of the colour in the rainfall has been identified, finding the answers to these questions is a challenge.’’

Parts of the CESS/TBGRI report were supported by Milton Wainwright at Sheffield University, who, together with Chandra Wickramasinghe, has studied stratospheric spores. In March 2006 he said the particles were similar in appearance to spores of a rust fungus, later saying that he had confirmed their similarity to spores or algae, and found no evidence to suggest that the rain contained dust, sand, fat globules, or blood. - Wikipedia

(c) 03/22/06 Ian Williams Goddard
Frames (1) and (2) show the microscopic spores that colored the Keralan rains; (3) rain samples with
(a) spores settled to the bottom, (b) rainwater evaporated, and (c) spores suspended in the rainwater; 
(4) Trentepohlia algae grown from the spores. [5]
Extraterrestrial Hypothesis

In 2003 Louis and Kumar, physicists at Mahatma Gandhi University in Kottayam, Kerala, posted an article entitled “Cometary panspermia explains the red rain of Kerala”[21] in the on-line, non-peer reviewed arXiv web site. While the CESS report said there was no apparent relationship between the loud sound (possibly a sonic boom) and flash of light which preceded the red rain, to Louis and Kumar it was a key piece of evidence. They proposed that a meteor (from a comet containing the red particles) caused the sound and flash and when it disintegrated over Kerala it released the red particles which slowly fell to the ground. Their work indicated that the particles were of biological origin (consistent with the CESS report), not inorganic material and they invoked the panspermia hypothesis to explain the presence of cells in a supposed fall of meteoric material. Additionally, using ethidium bromide they were unable to detect DNA or RNA in the particles. Two months later they posted another paper on the same site entitled “New biology of red rain extremophiles prove cometary panspermia” in which they reported that

    The microorganism isolated from the red rain of Kerala shows very extraordinary characteristics like ability to grow optimally at 300°C (572°F) and the capacity to metabolize a wide range of organic and inorganic materials.

These claims and data have yet to be reported in any peer reviewed publication. In 2006 they published a paper in Astrophysics and Space Science entitled "The red rain phenomenon of Kerala and its possible extraterrestrial origin" which reiterated their hypothesis that the red rain was biological matter from an extraterrestrial source but made no mention of their claims to having induced the cells to grow. One of their conclusions was:

    If the red rain particles are biological cells and are of cometary origin, then this phenomena can be a case of cometary panspermia.

Panspermia is the hypothesis that life on Earth was carried here from elsewhere in the universe. Fred Hoyle and Chandra Wickramasinghe have been among the proponents of the theory, but it has not been accepted by most mainstream scientists. The paper in Astrophysics and Space Science prompted numerous articles in the popular media.

Image: © Cardiff Centre for Astrobiology, Cardiff University.
This picture shows a single cell with a shrunken membrane containing what appear to be 'daughters' cells. Two of the daughters have well-defined cell walls while the third structure may be a further daughter in the process of development. Oddly, it does look like a classic "alien" face! Wickramasinghe also claims to have found DNA in the cells but says this needs to be confirmed. 


A quotation attributed to Carl Sagan that "Extraordinary claims require extraordinary evidence" is often used regarding the claims of alien life.

Samples of the red particles were also sent for analysis to Milton Wainwright at Sheffield University and Chandra Wickramasinghe at Cardiff University. Wickramasinghe has reported on December, 2006 that “work in progress has yielded positive for DNA”, but the results have not yet been confirmed. The absence of DNA is key to Louis and Kumar's hypothesis that the cells were of extraterrestrial origins.

Wainwright is quoted as saying:

    “There appears to be an increasing tendency among scientists to come up with wild explanations when asked by the press to comment on unusual, novel phenomena. A good example is provided by comments about the recent Indian red rain phenomenon."

A correction was printed in The Observer regarding Dr. Wainwright's comment that the red rain lacked DNA. Dr. Wainwright asked in the correction to make clear that he currently had no view on whether the samples contained genetic material or not, and that it was physicist Godfrey Louis who held that view. The controversial research of Louis et al. is the only evidence suggesting that these organisms are of extraterrestrial origin.

Sainudeen Pattazh came to the conclusion that, "Regarding red rain, there was an argument that it was alien presence. But that’s just like science fiction. During 2001-02, [a] peculiar geological situation was prevailing in Kerala like caving in of wells and landslides.”

A study has been published showing a correlation between historic reports of colored rains and of meteors.[29] In an interview[30] The author of the paper, Patrick McCafferty, said:

"Sixty of these events (coloured rain), or 36 per­cent, “were linked to meteoritic or cometary activity,” he went on. But not always strongly. Some­times, “the fall of red rain seems to have oc­curred af­ter an air­burst,” as from a meteor ex­plod­ing in air; oth­er times the odd rain­fall “is merely recorded in the same year as a stone-fall or the ap­pear­ance of a comet.”  - Wikipedia

Related Links

Image: © Cardiff Centre for Astrobiology, Cardiff University.


  1. Gentleman, Amelia; Robin McKie (2006). Red rain could prove that aliens have landed. Guardian Unlimited. Retrieved on March 12, 2006.
  2. ULY 28, 2001, The Hindu: Multicolour rain
  3. Louis, G.; Kumar A.S. (2006). "The red rain phenomenon of Kerala and its possible extraterrestrial origin". Astrophysics and Space Science. Retrieved on 2008-06-06. “([full paper]) (at journal website)”
  4. Ramakrishnan, Venkitesh (2001). Coloured rain falls on Kerala. BBC. Retrieved on March 6, 2006.
  5. Sampath, S.; Abraham, T. K., Sasi Kumar, V., & Mohanan, C.N. (2001). "Coloured Rain: A Report on the Phenomenon.". CESS-PR-114-2001. Center for Earth Science Studies and Tropical Botanic Garden and Research Institute. Retrieved on 2008-05-27.
  6. Radhakrishnan, M. G. (2001). Scarlets Of Fire. India Today. Retrieved on March 6, 2006.
  7. Mystery of the scarlet rains and other talesTimes of India, 6 August 2001
  8. Now wells form spontaneously in KeralaTimes of India, 5 August 2001 (from the Internet Archive)
  9. DiGregorio, Barry E. (2007). "What made the rain red in India? Isotopic analysis points to a terrestrial origin for the unusual organic particles that colored the rain like blood.". Analytical Chemistry (Washington, DC, United States) 79 (9): 3238. Retrieved on 2007-09-10. “My chemical tests are consistent with a terrestrial origin for this material. This doesn't mean it is not extraterrestrial, but it certainly does not support it”
  10. Lane, Megan. "It's raining fish!", BBC, 2000-08-07. Retrieved on 2006-03-06.
  11. Mill H. R., R. K. G. Lempfert, 1904, The great dust fall of February 1903 and its origin. Quart. J. Roy. Meteorol. Soc. 30:57.
  12. Satyanarayana, M.; Veerabuthiran S., Ramakrishna Rao D. Presennakumar B. (2004). "Colored Rain on the West Coastal Region of India: Was it Due to a Dust Storm". Aerosol Science and Technology 28: 24–26. Retrieved on 2008-05-30.
  13. Veerabuthiran, S.; Satyanarayana, M. (June 2003). "Lidar observations on atmospheric dust transported from south-west Asia to Indian west coast region: A case study of colour rain event occurred during July 2001". Indian Journal of Radio & Space Physics 32: 158-165. Retrieved on 2008-05-30.
  14. Varma, M. Dinesh. "Theory links 'scarlet rain' to Mayon volcano", The Hindu, Saturday, September 01, 2001. Retrieved on 2008-05-26
  15. Mayon eruption status update June 2001. Retrieved on 2008-05-26.
  16. Jet Streams around the World. BBC Weather Centre. Retrieved on 2008-05-26.
  17. "Red rain was fungus, not meteor", Indian Express, Monday, August 6, 2001. Retrieved on 2008-05-31.
  18. It's raining aliens. Retrieved on 2008-06-03. “transcript of a New Scientist podcast http://www.newscientist.com/podcast.ns”
  19. Benfield, Chris. "Is mysterious ‘red rain’ first evidence of life in space?", Yorkshire Today, Tuesday, 3rd June 2008. Retrieved on 2008-06-03.
  20. 1 April 2006, New Scientist: Red rain fantasies
  21. Louis, Godfrey; Kumar, A. Santhosh (5 Oct 2003). Cometary panspermia explains the red rain of Kerala. arXiv. Retrieved on 2008-06-01.
  22. Louis, Godfrey; Kumar, A. Santhosh (29 December, 2003). New biology of red rain extremophiles prove cometary panspermia. arXiv. Retrieved on 2008-06-01.
  23. Muir, Hazel. "When aliens rained over India", New Scientist, 02 March 2006. Retrieved on 2008-06-03.
  24. Red rain controversy: Aliens or hype?. The Why Files. Retrieved on 2008-06-04.
  25. kepticism greets claim of possible alien microbes. World Science (November 09, 2006). Retrieved on 2008-06-03.
  26. Cardiff Centre of Astrobiology: Analysis of Red Rain of Kerala. University of Cardiff. Retrieved on 2008-06-24.
  27. or the record, The Observer, March 12, 2006
  28. The Viewspaper - 5178 Pattazhy
  29. McCafferty, Partick (2008). "Bloody rain again! Red rain and meteors in history and myth". International Journal of Astrobiology. Retrieved on 2008-05-31.
  30. Claim of alien cells in rain may fit historical accounts: study”, World Science, January 22, <http://www.world-science.net/exclusives/080122_red-rain.htm>. Retrieved on 25 January 2008
  31. http://www.newkerala.com/july.php?action=fullnews&id=55259
  32. http://www.indiatogether.org/2006/sep/env-periyar.htm
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