What Caused the Red Rain of Kerala?

TL;DR

Blood-colored rain fell in Kerala, India from July to September 2001, leading to scientific study and the discovery of spores from a lichen-forming alga. In 2013, it was revealed that the spores came from Austria, solving the mystery.

Transcript

Between July 25 and September 23, 2001, the people of the southern India state of Kerala witnessed, on numerous occasions an extraordinary sight: blood colored rain. Although most reports limited the color of the rain to that striking red that resembled blood, some people also reported seeing green, black and even yellow rain as well. Eye-witnesses... Read More

Key Insights

• 🥺 Colored rain in Kerala, India between July and September 2001 puzzled scientists and led to intense study of the phenomenon.
• 😪 The rain contained red particles, mainly composed of carbon and oxygen, with traces of iron and silicon.
• ❗ The red particles were spores of a lichen-forming alga, likely triggered by increased growth due to heavy rains.
• 🖤 Scientists initially speculated about extraterrestrial origin and lack of DNA, but later identified the precise species of the algae.
• 🇦🇹 The spores were introduced into the atmosphere from Austria, explaining their presence in Kerala.
• 🧠 Strange rains are not uncommon throughout history, with examples like meat, frogs, and dust falling from the sky.
• 🧠 The hypothesis of waterspouts or tornadoes picking up and depositing small animals or objects explains some instances of "animal rain."

Questions & Answers

Q: What caused the colored rain in Kerala?

The colored rain was caused by spores from a lichen-forming alga called Trentepohlia. The spores came from local sources due to increased growth triggered by heavy rains.

Q: Why did the rain have different colors?

While most particles in the rain were red, there were also particles tinted green, bluish grey, and yellow. This could be due to variations in the composition of the spores or other factors.

Q: Were the spores of extraterrestrial origin?

Initially, there were speculations about the spores having an extraterrestrial origin, but it was later determined that they came from a lichen-forming alga belonging to the genus Trentepohlia found locally.

Q: How did the spores get into the atmosphere?

Scientists were initially puzzled about how the spores rose so high in the atmosphere. It was hypothesized that the spores were introduced through the clouds from Austria, as the precise species of the algae found was not native to India.

Summary & Key Takeaways

• Between July and September 2001, Kerala, India experienced the unusual occurrence of blood-colored rain, with reports of other colors as well.

• Scientists found that the rain contained red particles, mainly composed of carbon and oxygen, with traces of iron and silicon.

• The red particles were eventually identified as spores from a lichen-forming alga, believed to have come from local sources due to increased growth triggered by heavy rains.