Unveiling the Moon’s Mysteries: The Enigmatic Flashes of Light
The current tools allow us to see the universe that surrounds us in an unimaginable detail, a stark contrast to just a few years ago. Yet, humanity has spent millennia gazing up at the sky and pondering its mysteries . The closest celestial body to us is the moon, and nearly a thousand years ago, someone pondered why it shone like an emergency light .
Today, we have a scientific understanding—more or less. The fascination with the moon’s shimmering surface has persisted through the ages, culminating in various observations, from ancient times to modern astronomical studies.
The Dawn of Telescopic Astronomy
Flash. Although humanity has always looked skyward, it wasn’t until 1608 that we could do so with considerable detail. At that time, several lens manufacturers competed to become the inventors of the telescope. This innovation involved a simple tube fitted with a convex lens for the objective and a concave lens for the eyepiece, thus enabling deeper observations of our celestial neighbor. In 1609, Galileo Galilei learned of this invention and quickly constructed his version, taking full advantage of its potential.
Among his many accomplishments, he discovered Jupiter’s satellites and documented lunar craters. In those initial detailed observations, astronomers began to wonder why the moon emitted sporadic flashes of light. They were not the first to notice these fleeting occurrences.
A Glimpse into History: The First Recorded Observation
Luna beats. Let’s rewind to 1178, when Canterbury Gervasio, a monk, penned a remarkable recounting of his experience. He wrote: “On the afternoon of June 18, 1178, after sunset, when the moon had just become visible, a wonderful phenomenon was witnessed by five men or more. There was a bright new moon, their horns were inclined to the east and sudden sparks appeared.”
He elaborated further: “Meanwhile, the body of the moon, which was below, twisted, so to speak, with anxiety … the moon throbbed as a wounded snake. Then, it recovered its usual state. This phenomenon was witnessed repeatedly, adopting various random twisted forms before appearing blackish.”
Understanding the Phenomenon: Transient Lunar Phenomena
What does this say? Gervasio’s observations have laid the groundwork for our understanding of what is known as TLP (Transient Lunar Phenomena) . This term describes flashes or brightness observed on the lunar surface, often accompanied by darkening. The duration of these phenomena is brief, leading to several theories attempting to explain their occurrence.
Riddled. One prevalent theory suggests that the constant meteorite bombardment experienced by the moon may be responsible. This explanation is supported by substantial evidence. Estimates indicate that the moon suffers tens of thousands of meteor impacts every year. According to NASA, around 33,000 meteorites strike the moon annually, with about 100 of these approximately the size of a ping-pong ball reaching the surface with a force equivalent to about 3.2 kilos of dynamite .
Research such as that of Neliota has correlated these impacts with the flashes seen from Earth. On average, around eight flashes are observed per hour, but during periods of heightened meteoric activity, this figure can surge to twelve per hour.
Alternative Theories on Lunar Flash Phenomena
Alternatives. Other theories propose explanations for these luminous events that deviate from meteor impacts. Some scientists hypothesize that these flashes could result from gas emissions from the lunar subsoil—perhaps emanations of radon, a gas present on the moon—or geological fluctuations. While the meteorite bombardment theory remains the most supported, certain flashes appear to be unrelated to impacts.
Regardless of the underlying cause, it is intriguing to consider that if that English monk from 850 years ago could learn about our current understanding, he would likely be relieved to know that the moon’s rhythmic beats —those thudding sensations akin to a wounded snake—were not mere figments of imagination but glimpses into the enigmatic cosmos that continue to captivate our minds.
Images courtesy of the University of Canterbury, NASA, and the European Space Agency.
In addition, a meteorite that fell in the Sahara in 2023 turned out to be a piece of the moon, offering clues to solve an age-old enigma.