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Astronomy captivates the mind. The deeper you explore the cosmos, the more you realize how much remains to be discovered. Often, each breakthrough only brings more questions rather than providing answers.
However, the greatest enigmas of space aren't only concealed within black holes or distant galaxies. Some are surprisingly close to Earth. From the frozen dunes of Pluto to Jupiter’s glowing moon, our solar system hosts a variety of strange and bewildering phenomena. This compilation highlights some incredible secrets of the solar system that scientists are actively working to decode.
10. Mysterious Phenomena in Venus' Clouds
Venus' atmosphere is a realm of peculiar and hard-to-understand occurrences. Researchers believe that the swirling clouds of this neighboring planet hold key insights. Venus is thought to have once resembled Earth, with vast bodies of water covering its surface. However, due to toxic gases and intense heat, the once lush environment has transformed into the arid landscape we observe today.
But could it be, scientists speculate, that Venus once harbored life? And if so, might that life have survived by rising into the planet's clouds? Approximately thirty miles (fifty kilometers) above Venus' surface, the conditions are said to resemble those found on Earth, with similar temperature and pressure.
Entrepreneur Peter Beck has a deep fascination with Venus. In 2023, his company, Rocket Lab, intends to send a robot to explore the clouds of Venus in search of signs of extraterrestrial life. The California-based spacecraft firm aims to discover living organisms floating above the planet's barren terrain.
“We’re going to learn a great deal on the journey there, and we’ll take a shot at uncovering what lies in that atmospheric zone,” Beck said. “And who knows? We might strike it rich.”
9. A Space Hurricane Approaches Earth
In 2014, scientists observed an unusual vortex swirling high above the North Pole. This strange spiral of auroral light stretched more than 600 miles wide and illuminated the skies for eight hours before fading away. However, for some time, researchers were puzzled by this giant patch of light and uncertain about its origin and purpose.
Physicists from Shandong University in China have finally provided some clarity on this phenomenon. By analyzing satellite data gathered during the Cold War, Qing-He Zhang revealed that the mysterious ‘space hurricane’ observed in 2014 was a vast spiral of electrically charged gas. Such cosmic whirlpools are formed when electrons ejected by the sun cascade through Earth's magnetic field, striking gas atoms in the upper atmosphere and producing vivid flashes of light. Zhang and his team suggest that space hurricanes may have occurred prior to 2014, but this marks the first time scientists have identified one.
8. Methane May Indicate Life on Mars
Could there be life on Mars? David Bowie famously wondered about the possibility of aliens living on the Red Planet. Now, evidence suggests that there may indeed be life up there.
Astronomers have detected methane on Mars multiple times. The presence of this gas has led some scientists to theorize that life might exist on the Red Planet. On Earth, living organisms are the primary producers of methane, leading researchers to consider the possibility that life could produce methane on Mars as well. Every time new evidence of Martian methane is found, it brings us closer to understanding whether life exists on our neighboring planet.
In 2019, NASA's Curiosity rover discovered a sharp increase in methane levels in Mars' atmosphere. This spike was recorded within Gale, a 154km-wide (96 miles) crater that Curiosity has been exploring since its landing in 2012. Although this isn't the first time Curiosity has detected methane, the concentrations observed in 2019 were significantly higher than previous measurements from 2013 and 2014.
This extraordinary discovery points to the possibility of extraterrestrial life, but it does not yet serve as definitive proof of Martian microbes. Methane can also be produced through geological processes, such as when specific rock minerals react with water. More evidence is needed before astronomers can determine the true source of the gas.
7. Ice Dunes Found on Pluto
Pluto’s surface is an incredibly strange and enigmatic place. Once thought to be a lifeless and barren world, scientists assumed the dwarf planet lacked the atmospheric conditions necessary for dynamic features. However, recent images captured by NASA’s New Horizons mission have challenged that assumption. The photographs reveal a Pluto brimming with captivating and unique geological wonders.
Frozen methane dunes stretch across the Sputnik Planitia plains, while a massive range of water-ice mountains rises alongside them, with peaks reaching up to 5km (3mi) high. These mounds are created by small methane crystals—roughly the size of a grain of sand—that have been stirred by glacial winds from the nearby mountains. The dunes are also believed to contain frosted nitrogen crystals.
Pluto joins an expanding list of celestial bodies where astronomers have spotted dunes, a list that also includes Venus, Titan, and the comet 67P.
6. Strange Hum Detected on Mars
When NASA's InSight lander was dispatched to Mars in 2018, no one anticipated that it would pick up a hum coming from the planet. Yet, that is exactly what the spacecraft detected. According to InSight’s measurements, the Red Planet is continuously producing a hum, interrupted by quakes and tremors. The source of this mysterious phenomenon remains unexplained.
The InSight lander is equipped with a high-precision seismometer and a variety of detectors. Researchers note that data from the spacecraft has already provided invaluable insights into Mars' structure and magnetic field. Since landing, the craft has recorded over 450 instances of seismic activity—referred to as ‘marsquakes.’ Unlike Earth, Mars lacks tectonic plates, so scientists are still working to understand the causes of these quakes.
One of the most surprising discoveries from InSight is the persistent hum coming from Mars. The seismic signal resonates at 2.4 Hz and appears to intensify during quakes on the planet. Although scientists have eliminated wind as a potential cause, they are still unsure about the origin of this unexpected vibration.
5. Methane Rain on Saturn’s Largest Moon
Titan, the largest of Saturn’s moons, has several unusual weather patterns. Apart from Earth, it is the only known body in the solar system where liquid rain falls on a solid surface. However, unlike Earth, the rainfall on Titan is infrequent. According to NASA’s Cassini orbiter, there are areas of Titan that only receive rainfall around once every thousand years—and instead of water, it rains methane.
It might not rain often on Titan, but when it does it pours. Meters of rainfall can come cascading down in one shower. This severe battering etches deep river channels into the surface of the moon. Astronomers have even discovered vast lakes and seas of liquid methane.
One of the mysteries puzzling scientists is the lack of cloud cover around the North Pole. During a study of sunbeams on the moon, scientists recently observed rainfall during Titan’s summer for the first time. However, they were stumped why they had not spotted any clouds. Cracking this conundrum could expand our understanding of weather patterns in general. But for now, it remains unknown.
4. Europa, Jupiter’s Icy Moon, Might Glow in the Dark
A new study suggests that one of Jupiter’s moons might glow in the dark. Researchers reckon that Europa could emit a greenish glow caused by the intense radiation from Jupiter’s magnetic field.
Europa, one of Jupiter's icy moons, is covered by a thick blanket of frost. The moon constantly endures an unceasing barrage of electrons. When these charged particles collide with the surface of Europa, they transfer their energy to the ice molecules, which in turn release that energy as light, creating a glowing effect that scientists suggest could give the moon a ghostly shine.
3. ʻOumuamua: The Solar System’s First Known Interstellar Visitor
In 2017, a colossal, cigar-shaped object made history as the first recorded interstellar object to enter our solar system. This curious visitor sped past the sun at an incredible 196,000 miles per hour, leaving scientists baffled and eager to uncover its mysteries.
Astronomers understand that ʻOumuamua – which means 'a messenger from afar arriving first' in Hawaiian – entered our solar system from deep space. It is believed to be about half a mile (800 meters) long and about one-tenth of its length in width. The cosmic traveler is predicted to continue orbiting the sun for some time before moving on again.
Beyond that, very little is known about the elusive object. According to NASA, scientists have no definitive understanding of what ʻOumuamua looks like, what it is made of, or where it originated. An array of telescopes around the world and in space is actively monitoring the enigmatic visitor.
2. The Enigma of Rust on the Moon
You’re probably familiar with the fact that iron begins to rust when exposed to oxygen and water for long periods. So imagine the shock when scientists uncovered signs of rust on the Moon. Data from India's Chandrayaan-1 mission, analyzed by researcher Shuai Li from Hawaii, revealed unmistakable evidence of iron oxide, commonly known as rust, on the lunar surface.
Initially, scientists were baffled by Li's discovery. How could rust form on a celestial body with no oxygen? Moreover, the moon is constantly bombarded by hydrogen atoms from solar winds, and hydrogen is notorious for giving away its electrons, making it even harder for iron to oxidize. Rust should be impossible in such conditions, yet the data left no room for doubt.
Then, the key breakthrough emerged. Researchers found that the solution lies in the Earth’s magnetic field. Like the Moon, Earth is also subject to solar winds that distort its magnetic field. This distortion causes the farthest part of the field, called the magnetotail, to stretch backward, extending up to 240,000 miles (385,000 kilometers) into space.
As the Moon orbits Earth, it occasionally enters this magnetotail. In this brief moment, the Moon is shielded from the usual onslaught of hydrogen atoms. The magnetic field also releases small amounts of oxygen onto the lunar surface. For just a short time, the conditions are perfect for rust to form.
1. An Unusual Mass Concealed Beneath the Moon's Surface
Hidden beneath the solar system's largest crater is a mysterious mass made of metal, whose origins remain uncertain. This peculiar object is believed to be five times the size of the Island of Hawai’i, lying beneath the South Pole-Aitken basin on the moon's far side.
The crater is shaped like an oval, stretching over 1,200 miles in diameter and plunging deep into the moon's surface. It is thought to have formed four billion years ago. However, the metallic mass rests hundreds of miles below the surface. Astronomers discovered this anomaly during an investigation of the moon’s surface and gravitational variations.
Researchers are eager to uncover the origins of this baffling underground structure. One hypothesis suggests it could be the remnant of the asteroid that formed the crater. Meteorite cores typically consist of an iron-nickel alloy, and simulations indicate that such a core might have been trapped within the moon’s mantle. Another theory proposes that the mass may be linked to the solidification of cooling oceans of liquid magma.
