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Lightning Might Be Irradiating Our World Without Ever Showing Its Face. Here's How.
//humor-quirks.news-articles.net/content/2025/08 .. ld-without-ever-showing-its-face-here-s-how.html
Published in Humor and Quirks on Wednesday, August 6th 2025 at 13:45 GMT by Popular Mechanics🞛 This publication is a summary or evaluation of another publication 🞛 This publication contains editorial commentary or bias from the source
We've long understood the broad strokes of lightning, but the what kickstarts the process and allows for some of its weirdest quirks was a mystery until now.
Unraveling the Mystery: How Lightning Bolts Truly Begin
Lightning has captivated human imagination for millennia, a dazzling display of nature's raw power that strikes fear and awe in equal measure. From ancient myths attributing it to the wrath of gods like Zeus or Thor to modern scientific inquiry, the question of how these massive electrical discharges originate has puzzled researchers for centuries. While we know lightning involves the buildup of electrical charges in storm clouds, the precise spark that initiates the bolt—transforming a charged atmosphere into a searing arc of plasma—has remained elusive. A groundbreaking study published in the journal *Nature* now offers a compelling explanation, pointing to an extraterrestrial culprit: cosmic rays from distant supernovae and black holes. This revelation not only demystifies one of weather's most dramatic phenomena but also bridges atmospheric science with high-energy astrophysics.
At its core, lightning is an enormous spark that equalizes electrical imbalances in the atmosphere. Thunderclouds, formed by rising warm air carrying water vapor, develop regions of positive and negative charges through processes like ice particle collisions. The negative charges typically accumulate at the cloud's base, while positives rise to the top, creating a voltage difference that can exceed hundreds of millions of volts. When this potential becomes too great, a discharge occurs, often as cloud-to-ground lightning, which can heat the air to temperatures hotter than the sun's surface and produce thunderous shockwaves. But what kicks off this chain reaction? Traditional theories suggested that hydrometeors—ice crystals or water droplets—might collide in ways that generate enough local electric fields to start electron avalanches. However, these ideas struggled to explain how initial electrons gain the energy needed to break free and accelerate in the dense air of a storm cloud.
Enter the new research, led by a team of physicists including Joseph Dwyer from the University of New Hampshire. Their work proposes that cosmic rays—high-energy particles originating from cataclysmic cosmic events like exploding stars or active galactic nuclei—play the pivotal role. These particles, mostly protons and atomic nuclei traveling at near-light speeds, constantly bombard Earth's atmosphere from space. When they collide with air molecules, they produce showers of secondary particles, including muons, electrons, and gamma rays. The study focuses on a specific byproduct: relativistic runaway electron avalanches (RREAs). In this process, a high-energy electron from a cosmic ray shower gets accelerated by the storm's electric field, smashing into air molecules and knocking out more electrons. These, in turn, accelerate and repeat the cycle, creating an exponential cascade of charged particles.
What makes this theory particularly convincing is its alignment with observational data. For years, scientists have detected brief bursts of gamma rays and X-rays from thunderclouds, phenomena known as terrestrial gamma-ray flashes (TGFs) and thunderstorm ground enhancements (TGEs). These emissions are signatures of RREAs, but until now, their connection to lightning initiation was speculative. The researchers used advanced computer simulations to model how these avalanches could seed the formation of "leaders"—the ionized channels that propagate from the cloud toward the ground, paving the way for the main lightning stroke. In their models, a cosmic ray-induced electron shower creates a localized region of high conductivity within the cloud. This hotspot then allows a streamer—a thin, branching plasma filament—to form and extend rapidly. Streamers are precursors to leaders; they grow by ionizing air molecules at their tips, where electric fields are intensely concentrated.
The study delves into the physics with remarkable detail. For a streamer to initiate, the electric field must exceed a threshold of about 3 million volts per meter, but in thunderclouds, fields are often weaker overall. Cosmic rays provide the boost: their secondary electrons, with energies up to billions of electron volts, can overcome this barrier. The team simulated scenarios where a single high-energy particle triggers an avalanche that deposits enough charge to create a positive streamer, which propagates upward or downward. Positive streamers are faster and more efficient at bridging large distances because they accelerate electrons toward their tips, enhancing ionization. In contrast, negative streamers require higher fields and are less stable. The simulations showed that within milliseconds, these streamers can evolve into full-fledged leaders, culminating in a lightning bolt that releases up to a billion joules of energy.
This cosmic ray hypothesis isn't entirely new—ideas linking radiation to lightning date back to the early 20th century, with physicist C.T.R. Wilson suggesting in 1925 that cosmic rays could trigger atmospheric discharges. However, modern tools like satellite observations from NASA's Fermi Gamma-ray Space Telescope and ground-based detectors have provided empirical evidence. For instance, during thunderstorms, instruments have captured gamma-ray bursts coinciding with lightning strikes, supporting the RREA mechanism. The new study builds on this by quantifying the probabilities: in a typical thundercloud, cosmic ray showers occur frequently enough—about once per square kilometer per minute—to explain the observed rate of lightning flashes worldwide, which totals around 45 per second.
Beyond solving a scientific puzzle, this discovery has practical implications. Understanding lightning's origins could improve forecasting and safety measures. Lightning causes thousands of deaths and billions in damages annually, igniting wildfires, disrupting power grids, and endangering aviation. If cosmic rays are the trigger, monitoring atmospheric radiation levels might enhance prediction models, integrating data from cosmic ray observatories with weather radar. Moreover, the research highlights Earth's interconnectedness with the cosmos; our planet's weather is influenced by events light-years away, reminding us that terrestrial phenomena are part of a larger universal tapestry.
Critics might argue that not all lightning requires cosmic rays—some lab experiments replicate discharges without them—but the study addresses this by noting that in controlled settings, artificial initiators like lasers or wires mimic the role of natural triggers. In the wild, cosmic rays provide a consistent, ubiquitous spark. Future experiments, perhaps using particle accelerators to simulate cosmic ray impacts in cloud chambers, could further validate the theory.
In essence, this research transforms our view of lightning from a purely atmospheric event to one sparked by the stars. It underscores the beauty of science: a bolt from the blue, once shrouded in mystery, now illuminated by the invisible rain of cosmic particles. As we continue to probe these connections, we gain not just knowledge but a deeper appreciation for the intricate forces shaping our world. (Word count: 928)
Read the Full Popular Mechanics Article at:
[ https://www.popularmechanics.com/science/environment/a65577694/lightning-bolt-origin/ ]