UNSOLVED PUZZLES
10 baffling natural phenomena we still don't fully understand
Published on January 24, 2025
Image: Stormseeker
We have certainly come a long way since the first humans began wondering about the nature of the universe. But even with significant technological and scientific progress behind us, some phenomena remain elusive, even to experts. These unsolved mysteries continue to baffle researchers, often hinting at how much we still have to learn about the universe. So, jump aboard and join us on this journey through some of nature’s most intriguing mysteries, from dark matter to the reasons behind why we yawn!
Where is all the matter in the universe?
Image: arnaud girault
You might think this is a rather dumb question, but its answer is something that keeps many scientists awake at night. The fact is that, according to the best calculations, the universe is missing a lot of mass. And by a lot, we mean A LOT—up to 85% of the total mass we can estimate from gravitational effects is nowhere to be found.
This has led scientists to posit the existence of an invisible form of mass that could account for many otherwise unexplained cosmic phenomena (such as the acceleration of the universe’s expansion), fittingly called "dark matter." Undetectable by most conventional means, recent experiments have allowed scientists to explore this mystery further. Some speculate that dark matter could consist of a new type of subatomic particle or even millions of minuscule primordial black holes.
Mysteries of the night
Image: Jr Korpa
Dreaming seems like such a natural and commonplace phenomenon that we rarely question why we do it. The nature of dreams has fascinated humans since ancient times, with beliefs about their causes varying widely across cultures and centuries. But despite recent advancements in neuroscience and related studies of the human brain during sleep, both the purpose and precise origin of dreams remain unknown.
So far, we only know with certainty that dreams primarily occur during the rapid eye movement (REM) stage of sleep. During this stage, brain activity is surprisingly high, resembling a state of wakefulness. Some theories propose that dreams help process emotions, solve problems, or even simulate threats, but their true function remains one of neuroscience's greatest mysteries.
Great balls of fire
Image: Amos
Sometimes, during thunderstorms, people have observed a baffling phenomenon: ball lightning. These are luminescent, spherical objects that seem to fly erratically over the ground, only to suddenly disappear without a trace. This rare and elusive weather phenomenon has been reported since the 19th century, and it has been suggested as the origin of many ancient myths and legends.
While scientists have yet to determine its exact origin, there have been advances in experimentally reproducing the phenomenon through various methods. Hypotheses range from the vaporization of silica in the soil by lightning strikes to the disturbing possibility that ball lightning is entirely a product of lightning-induced hallucinations in the observers' minds.
Life beyond Earth
Image: Lamna The Shark
Are we alone in the universe? So far, the search for extraterrestrial life has not yielded any significant results, though some recent findings have excited scientists about the possibilities. Traces of chemicals often associated with biological processes have been detected in Venus’ upper atmosphere, hinting at the possibility of extraterrestrial microorganisms being present in the planet’s clouds. However, further research is needed to confirm these findings.
Also, there is the still largely unexplained "Wow! Signal," a mysterious radio signal picked up by the Ohio State University's Big Ear radio telescope in August 1977, which some researchers have suggested could be a sign of intelligent life. The signal appeared to come from the direction of the constellation Sagittarius, but it has not been detected again since.
The placebo effect
Image: James Yarema
A very well-documented phenomenon, to the point where it is essential to account for its effects in randomized clinical trials to test the efficacy of various medical treatments, the placebo effect remains largely a mystery to science. How can a sugar pill or an inert saline injection produce real, measurable health benefits instead of doing nothing at all?
Most hypotheses point to psychological mechanisms at play, where the belief in treatment activates the body's natural processes for relieving pain and other symptoms. This "ritual effect" could influence the individual's expectations, preparing them to feel better.
A mysterious explosion
Image: Dmitrii Shirnin
In 1908, an extremely violent explosion seemingly out of nowhere flattened over 80 million trees in a vast forest area in Siberia. With an estimated force of 3 to 50 megatons (for comparison, a modern nuclear weapon yields just over 1 megaton), the explosion left no distinguishable impact crater, suggesting that it occurred above the ground.
So far, the leading explanation for the event is a meteor airburst—an explosion of a large rocky asteroid entering the atmosphere at an altitude of 3 to 6 miles. Despite the area being very sparsely populated, eyewitness accounts report observing a bluish light moving across the sky before the time of the explosion, supporting the meteor hypothesis. The sudden burst of energy was reportedly so strong that its shockwave knocked people off their feet and broke windows hundreds of miles away.
The origin of life
Image: Adrian Lange
The origin of life on Earth, known as abiogenesis, remains a mystery. Various theories exist, from life emerging through almost spontaneous chemical reactions in a primordial soup to the idea of panspermia, which suggests that life could have originated elsewhere in the universe and been brought to Earth by meteorites.
The prevailing hypothesis, however, is that life did not originate from a single event but rather through a complex process involving many stages. Connected to this mystery is the question of whether life can exist in forms different from those we know, potentially using elements other than carbon and water.
Saturn’s weirdly geometrical storm
Image: NASA/JPL-Caltech/Space Science Institute
Saturn's north pole is home to a giant hexagon-shaped storm, a phenomenon unlike anything else seen in the solar system. This strange phenomenon was first discovered during the Voyager mission in 1981 and was later revisited by the Cassini-Huygens probe in 2006. Curiously, the hexagon seems to change colors over time, exhibiting variations from bluish to golden hues.
Some of the most compelling hypotheses point to complex atmospheric dynamics, such as wind patterns and pressure variations, as potential culprits for the storm’s bafflingly geometric shape. Experimental tests have managed to recreate similar patterns under laboratory conditions, but it remains uncertain whether these processes mirror those observed on Saturn.
Slime from the stars
Image: Clay Banks
Star jelly is a mysterious, transparent gelatinous substance occasionally found on the ground or on tree branches. Since ancient times, its appearance has been linked to meteor showers and similar celestial phenomena. Theories about its origin vary widely, ranging from unfertilized frog spawn or even frog vomit to different species of slime mold or algae colonies.
However, no scientific consensus has been reached, and its true origin and nature remain unknown. Scientists have yet to conclusively determine where star jelly comes from.
Why do we yawn?
Image: Miikka Luotio
If this article has got you yawning (we hope not!), you’re encountering one of life’s many unexplained mysteries right under your nose! Yawning is a universal human experience, yet its purpose remains unclear. Various theories suggest that yawning might help cool the brain, increase alertness, or even serve a social function, but no single explanation has been universally accepted.
Curiously, yawning is not limited to humans; it occurs in almost all vertebrate animals, including mammals, birds, reptiles, amphibians, and even fish!
