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Long before humans appeared, Earth was a vastly different realm. The planet has undergone remarkable transformations over the last 4.5 billion years—changes far more extraordinary than you could ever imagine.
Imagine stepping back in time and standing on Earth millions of years ago. You wouldn’t just encounter a few unfamiliar creatures; instead, you'd find a world straight out of a sci-fi fantasy, almost like an alien landscape.
10. Enormous Mushrooms Dominated the Planet
Around 400 million years ago, trees grew only as tall as a person’s waist. Most were just a few feet in height, and other plants and fungi were similarly small—except for the mushrooms. During a certain period in Earth's past, mushrooms known as Prototaxites appeared across the planet, towering over every other form of life.
These mushrooms had trunks that reached up to 8 meters (26 feet) high and were 1 meter (3 feet) in diameter. While they were smaller than many modern trees, they were the largest plants and fungi of their time, stretching up to 6 meters (20 feet) above the rest of the flora.
Unlike today’s mushrooms with their large caps, these ancient giants lacked such features. Instead, they were primarily just a tall, thick fungus stalk protruding from the earth. And they were widespread. Fossils of these mushrooms have been discovered on every continent, meaning you wouldn’t find a place on Earth without encountering vast forests of enormous mushrooms.
9. The Sky Was Orange, And The Oceans Were Green
The sky wasn’t always the blue we know today. Around 3.7 billion years ago, the oceans appeared green, the continents were dark, and the sky above resembled a blurry orange haze.
Back in the day, Earth’s composition was drastically different, which likely gave rise to a completely unique color palette. The oceans appeared green due to iron formations dissolving into the seawater, creating a greenish rust that stained the waters like an old copper penny. The continents were black, as they would have been coated with cooling lava, devoid of any plant life to conceal it.
The sky wasn’t blue either. The reason the sky is blue today is due to oxygen in the atmosphere, but 3.7 billion years ago, oxygen levels were low. Instead, methane filled the air, and as sunlight passed through the methane-rich atmosphere, it would have cast a hazy orange glow across the sky.
8. The Planet Reeked of Rotting Eggs
We don’t just speculate about how the planet looked—we can also make educated guesses about how it smelled. If anyone had been around 1.9 billion years ago to take a breath, they would have detected the unmistakable scent of rotting eggs.
This stench came from the oceans, which were teeming with bacteria that consumed salt from the seawater. These bacteria then released hydrogen sulfide, filling the air with a foul odor that scientists believe would have resembled eggs that had spoiled.
But let’s be real here—scientists are being polite. In simpler terms, they’re just saying that the Earth smelled like flatulence. These bacteria were producing potent, frequent farts, releasing hydrogen sulfide into the air.
7. The Planet Was Covered in Purple
When the first plants began to sprout on Earth, they weren’t green. Some theories suggest they were actually purple. If you had viewed Earth from space three or four billion years ago, you would have seen a world as purple as it is green today.
It’s believed that the earliest life-forms on Earth absorbed sunlight in a completely different way. Today’s plants are green due to chlorophyll, but these first plants are thought to have used retinal, which would have made them a brilliant shade of violet.
Purple may have been the dominant color for a long time. Around 1.6 billion years ago, after plants had turned green, it's believed some of Earth's oceans also took on a purple hue. A dense layer of purple sulfur covered the water's surface, enough to make the entire ocean look purple and dangerously toxic.
6. The Earth Resembled a Snowball
We all know about Earth’s ice ages, but there’s more recent evidence suggesting one from 716 million years ago was as extreme as anything seen in cartoons. This period, called the “Snowball Earth,” might have been so engulfed in ice that the entire planet appeared as a giant white snowball drifting through space.
The planet was so cold that glaciers reached the equator. Scientists confirmed this by discovering signs of ancient glaciers in Canada. Although it might sound strange, 700 million years ago, that part of Canada was situated at the equator.
As a result, the warmest regions on Earth were as frigid as the modern Arctic. However, scientists no longer believe it truly resembled a white snowball, because there was another terrifying aspect of life 716 million years ago: volcanoes were constantly erupting, spewing ash into the air and turning the ice and snow into a dirty, blackened mess.
5. Acid Rain Poured Down On Earth For 100,000 Years
Eventually, the Snowball Earth era came to an end—in the most nightmarish way possible. It’s believed that Earth underwent a period of what scientists call “intense chemical weathering.” In simpler terms, this means that for 100,000 years, acid rain relentlessly fell from the sky.
The acid rain was so fierce and heavy that it melted the glaciers covering the planet. Ultimately, this was one of the best things to ever happen to Earth. It flushed nutrients into the ocean, allowed life to flourish beneath the sea, released oxygen into the atmosphere, and paved the way for the Cambrian explosion of life on Earth.
At the time, however, it was a nightmare. The air was saturated with carbon dioxide, and the acid rain even poisoned the oceans. So, before life could thrive, Earth had to first become a toxic, uninhabitable wasteland.
4. The Arctic Was Once Lush And Brimming With Life
Around 50 million years ago, the Arctic was an entirely different world. This was during the early Eocene Epoch, when Earth’s climate was far warmer. Palm trees could be found in Alaska, and crocodiles swam along the shores of Greenland.
Even the northernmost parts of the planet were rich with greenery. The Arctic Ocean is thought to have been a vast freshwater lake, teeming with life. It was filled with green plants, particularly a fern called Azolla that flourished across the Arctic.
It wasn’t quite a tropical paradise, though. During this period, the warmest Arctic months only reached about 20 degrees Celsius (68 °F). Nonetheless, the northern regions were home to giant tortoises, turtles, alligators, and early hippos, all adapting to survive in an environment marked by long winters of total darkness.
3. Gigantic Insects Dominated The Land
Around 300 million years ago, the Earth was dominated by enormous lowland swamp forests, and the air was packed with oxygen. There was about 50 percent more oxygen than we breathe today, fueling an explosion of life. This abundance of oxygen also gave rise to enormous, terrifying insects that seemed like they could come straight out of a Godzilla movie.
For some creatures, the surplus of oxygen in the atmosphere was overwhelming. Small insects couldn’t cope, so they began to evolve into larger forms. In fact, some reached colossal sizes. Fossils of dragonflies have been found that were as large as modern seagulls, with wingspans exceeding 0.6 meters (2 ft).
Huge beetles roamed the Earth alongside all sorts of other gigantic insects. But they weren’t harmless. Those enormous dragonflies, scientists believe, were ferocious, flesh-eating predators.
2. Liquid Hot Magma Rained Down
However, that asteroid was a mere blip compared to the bombardment Earth faced four billion years ago. In the planet’s formative years, a relentless shower of asteroids battered Earth, transforming it into a hellscape that would rival any nightmare.
The planet's oceans became so incredibly hot that they boiled away. The immense heat from asteroid impacts vaporized the Earth's first oceans, turning them into steam that simply drifted away into nothingness. Vast portions of Earth’s surface melted, with rock masses turning into a liquid and flowing like slow-moving rivers, heated to unimaginable temperatures.
As if that wasn’t catastrophic enough, some of the rock was vaporized into Earth’s atmosphere. Magnesium oxide rose into the atmosphere, evaporating like water, and condensed into droplets of scalding liquid magma. This meant that, far more often than we experience rain today, Earth would have witnessed liquid magma pouring down from the skies.
1. Dust Blocked Out The Sun
When the asteroid that is often credited with wiping out the dinosaurs struck Earth 65 million years ago, it didn't end the devastation there. The planet transformed into a dark, scarred wasteland, and the aftermath was even more horrific than you could ever imagine.
The impact sent massive amounts of dust, soil, and rocks flying into the sky, some of which even reached space. But the majority got trapped in the atmosphere, creating an enormous dust cloud that engulfed the entire planet. For the survivors on Earth, the Sun was completely hidden from view.
This dark period only lasted for a few months at most. However, even after the dust cloud dissipated, sulfuric acid remained suspended in the stratosphere and entered the clouds. The result was a thick layer of clouds that blocked the Sun’s rays and triggered a decade of relentless, acid rain storms.
