The universe revealed

Mind-blowing truths: 10 space facts you won’t believe are real

Did you know that everything we know about the universe makes up only about 5% of it? Even so, there’s still much that might surprise you. On some planets, a year is shorter than a day, while on others it can literally rain diamonds. From the smell of comets to the color of Mars’ sunsets, here are 10 incredible facts about the universe you probably didn’t know.

Perhaps if the Weather Girls had been born on Neptune or Uranus, their famous hit might have had a very different title, because something extraordinary may happen on these planets: it can rain diamonds! The immense pressures in their atmospheres can compress carbon into diamond crystals, which then sink deeper into the planets’ interiors.

If you are reading this at night, step out into your backyard and take a look at the Moon. While we often assume everyone sees the Moon the same way, that’s not true. In fact, the Moon appears "upside down" in the Southern Hemisphere. This happens because your perspective changes relative to the Moon: in the Northern Hemisphere, you’re viewing it from "above" the equator, while in the Southern Hemisphere, observers see it from "below."

Saturn, the second-largest planet in our solar system, has a diameter of about 74,897 miles, making it roughly nine times wider than Earth. Surprisingly, it’s theoretically possible for Saturn to float on water... if only you could find an ocean big enough! This isn’t because of its size, but because of its composition: the planet is mostly made of hydrogen and helium, extremely light gases that make Saturn less dense than water.

Remember that time you got distracted and the steak on the stove got a little burnt? Surprisingly, the smell in your kitchen isn’t too different from what astronauts report after spacewalks. Scientists have noticed that objects returning from space, especially those exposed to the vacuum outside the spacecraft, carry a distinctive odor often described as burnt steak or welding fumes.

It takes Earth about 365 days to orbit the Sun, which is why our year is that long. A day, on the other hand, lasts just 24 hours because that’s how long it takes Earth to complete one full rotation on its axis. But on Venus, things work very differently. A single day on Venus (the time it takes to rotate once on its axis) is about 243 Earth days, making its rotation extremely slow. Surprisingly, a year on Venus is shorter than its day, because it only takes about 225 Earth days for Venus to orbit the Sun. Incredible, isn’t it?

Since we see the Moon in the sky nearly every night, it’s easy to forget that it’s a giant rock floating far away in space. In fact, the distance between Earth and the Moon is about 238,900 miles, so vast that, in theory, you could line up all the other planets in our solar system across that gap!

Mars is famously called the "Red Planet" because its surface is covered in iron oxide (rust), giving it a reddish appearance from afar. But if you were standing on Mars at sunset, you’d get a surprise: unlike Earth’s warm orange, gold, and pink hues, Martian sunsets appear blue. This happens because the planet’s thin, dusty atmosphere scatters sunlight differently, allowing blue light to dominate near the Sun at sunset.

Comets, made of ice, dust, and frozen gases, are truly spectacular to see. But if you could smell them, they might not be so pleasant. As a comet nears the Sun, its ices sublimate, turning directly from solid to gas and releasing various compounds. Among these are sulfur-containing gases, which give off a strong rotten-egg smell.

Scientists can estimate the number of stars in the universe using observations and projections. Astronomers observe a small patch of the sky, count the galaxies and stars there, and then extrapolate those numbers to the entire observable universe. While Earth has an incredible number of sand grains, these calculations suggest that there are far more stars than grains of sand. If you're not impressed yet, remember that many of those stars are much larger than any planet!

If the last fact shocked you, this one will totally blow your mind. While our galaxy has far fewer stars than the entire observable universe, you might be surprised to learn that trees on Earth actually outnumber the stars in the Milky Way. That’s right! Scientists estimate there are roughly 3 trillion trees on our planet, while the Milky Way contains only about 100 to 400 billion stars.

10 weird historical events that no one has been able to explain (yet)

Image: Walters Art Museum, Public domain, via Wikimedia Commons

Who doesn't like a good mystery? And if the mystery isn’t a work of fiction but the result of a true story, even better! The great unsolved enigmas of history are absolutely fascinating. Some have been solved over time, but there are still many old secrets for which neither scientists nor historians have found an explanation—yet. Time-travel with us as we uncover 10 of the biggest historical mysteries that will probably never be cracked!

Image: Tanner, Henry S., Public domain, via Wikimedia Commons

Bermeja Island is mentioned in navigation texts written by European travelers and appears in cartography from the 16th to 19th centuries. Old maps place it off the north coast of the Yucatán Peninsula; however, multiple searches over the years have yielded no concrete evidence of its existence.

So, what happened to Isla Bermeja? Was it a cartographic error? Did it sink due to a tidal wave? Because of its geopolitical significance, some have even suggested that it was blown up by the CIA! A 2009 study by the Autonomous University of Mexico concluded that Isla Bermeja does not exist today, nor were any traces found at its supposed coordinates. Yet, it will forever remain a mystery that will surely keep many entertained.

Image: Credit: Big Ear Radio Observatory and North American AstroPhysical Observatory (NAAPO)., Public domain, via Wikimedia Commons

In 1977, Ohio State University’s Big Ear radio telescope, used in the search for extraterrestrial intelligence, detected a signal now known as the Wow! signal. While reviewing the data, astronomer Jerry R. Ehman noticed a sequence represented as "6EQUJ5." Baffled by the anomaly, he circled it and wrote "Wow!" in the margins.

The signal lasted 72 seconds and, unfortunately, has never been repeated. To this day, no one can fully explain the phenomenon, although some suggest it may have come from a man-made source. Still, the Wow! signal remains one of the strongest candidates for potential extraterrestrial contact ever detected.

Image: Edward S. Curtis, Public domain, via Wikimedia Commons

How is it possible for an entire village to vanish without a trace? Believe it or not, this is said to have happened nearly a century ago. According to lore, a small Inuit village in Canada was well known among fur trappers who visited regularly to trade. But in 1930, something very strange supposedly occurred.

A hunter named Joe Labelle claimed he visited the village one day and couldn’t find a single person. Reports said there were guns and food left behind, and even claims that the graves in the cemetery were empty. A thorough investigation, however, found no conclusive evidence of what happened to the villagers. Some witnesses from nearby towns even reported seeing a huge green light. Theories ranged from mass migration to extraterrestrial abductions. The Royal Canadian Mounted Police has since dismissed the case as an urban legend. Some still believe the story to be true.

Image: bbb

We know thousands of shipwreck stories, but this one is quite unique. The MV Joyita, designed to be nearly unsinkable, was found adrift in the South Pacific, practically unharmed, but the crew had disappeared completely.

In October 1955, the American merchant vessel left the port of Apia in Samoa with 16 crew members and 9 passengers bound for the Tokelau Islands. After days without news, a rescue mission was launched. Five weeks later, the Joyita was spotted more than 600 miles west of its intended route. The vessel was partially submerged, and there was no sign of the passengers or crew. Four tons of cargo and all three life rafts were missing. They were never seen again.

Image: Gary Todd from Xinzheng, China, CC0, via Wikimedia Commons

Do you know where one of the best-preserved mummies was found? Hint: not in Egypt. Xin Zhui, the Marquise of Dai during the Western Han Dynasty in China, was discovered in her tomb at Mawangdui 2,000 years after her death, along with hundreds of valuable documents and artifacts.

What makes this mummy so extraordinary is how well-preserved her body is. Her organs and veins remain intact, and she still has hair and even eyelashes. Scientists analyzed the fluid present in the coffin and discovered it was acidic and contained salt and magnesium. They believe this mysterious liquid may have been responsible for preserving Xin Zhui so well. What they don’t know is whether it was intentionally poured into the coffin or came from the body itself.

Image: Yoichi Okamoto, Public domain, via Wikimedia Commons

The United States has its fair share of presidents who died while in office, but none of our 45 presidents have ever disappeared without a trace. Did you know that this actually happened in The Land Down Under?

Harold Edward Holt was the Prime Minister of Australia from 1966 until his presumed death in 1967. He loved the ocean and spearfishing. During a weekend trip with friends, Holt visited the remote Cheviot Beach to take a swim. Rough sea conditions that day caused him to be swept away by the waves, and he never reappeared. Despite an intensive search, his body was never found, which has given rise to numerous conspiracy theories. Ironically, Australians built the Harold Holt Memorial Swimming Centre in Melbourne in his honor.

Image: FBI, Public domain, via Wikimedia Commons

Many famous criminals have managed to remain unidentified for decades, but the D.B. Cooper case is something else entirely. In 1971, Cooper boarded a flight from Portland to Seattle. Shortly after takeoff, he showed a flight attendant a device he claimed was a bomb and demanded four parachutes and $200,000 in cash.

The crew landed to meet Cooper’s demands in exchange for the passengers and then took off again. As the plane flew over southwestern Washington, Cooper jumped into the cold, rainy night carrying his haul. His whereabouts and true identity were never discovered, although it is likely he didn’t survive the jump. In 1980, some of the ransom money was found near the Columbia River. Although the FBI officially closed the case in 2016, amateur sleuths continue to try to crack it.

Image: Pieter Brueghel the Elder, Public domain, via Wikimedia Commons

Can you imagine an epidemic where the main symptom is uncontrollable dancing? Sounds like science fiction, doesn’t it? Yet this really happened during the Middle Ages. In 1518, a dancing plague struck Strasbourg, Alsace, in what is now France. This strange condition affected up to 400 people, making them dance frantically for weeks. It is said that some even died of heart attacks, exhaustion, or strokes.

Doctors and authorities tried all kinds of measures to stop the spread. They even banned music for a while! To this day, scientists are not certain what caused this bizarre condition: it may have been food poisoning from toxins in the ergot fungus, or perhaps a case of stress-induced mass hysteria.

Image: Public domain, via Wikimedia Commons

The Voynich manuscript is a codex written roughly 500 years ago in an unknown language and writing system by an anonymous author. Known as Voynichese, the manuscript was named after Wilfrid Voynich, a Polish bibliophile and antiquarian who purchased it in 1912.

Radiocarbon testing has shown that it dates to the early 15th century. Many cryptographers and codebreakers have attempted to decipher its roughly 240 pages without success. The manuscript contains diagrams and illustrations of unknown plants and astrological symbols. Some believe it may be a made-up language, a secret code, a work of fiction, or even a hoax. If you think you can solve this mystery, the Voynich manuscript is available for viewing at Yale University’s Beinecke Rare Book and Manuscript Library.

Image: Bernhard

Similar to the Voynich manuscript, the Phaistos Disc is a fired clay disc believed to have been created during the Bronze Age. It was discovered by an Italian archaeologist in the basement of a palace in Crete, Greece, in 1908.

What makes this disc fascinating is that it contains a mysterious message. Stamped into the clay is a set of signs, forming a text that many scientists have tried to decipher—without success. It is considered an early attempt at printing, a technological innovation that would not become widespread for several centuries. While enthusiasts still hope the enigma can be solved, this is unlikely unless other documents are discovered to provide context.