22 juillet 2015

Cauchemardesque préhistoire

Voici la liste de 6 réalités de notre passé préhistorique qui font passer les mondes les plus déjantés de la science-fiction pour des jolis contes pour enfants, comme quoi la réalité dépasse toujours la fiction:

#6. Before Trees, There Were Fungus Forests

Travel back around 400 million years, and you wouldn't have seen any forests, but that doesn't mean there wasn't anything to fill that particular role in nature. Before trees, Earth was covered in "forests" of 20-foot-tall mushrooms.

#5. The Ancient World Was Populated By Giant Insects

In the Carboniferous, you would have had to contend with scorpions the size of dogs, caterpillars you could mistake for anacondas, and dragonflies that could fight an albatross.

#4. The Planet Was Purple

If you got sucked through a wormhole while piloting a space shuttle and wound up orbiting Earth 3 or 4 billion years ago, it would've looked extra fabulous. One hypothesis says that the planet would actually have been purple.

#3. Earth Had Two Moons

Scientists have wondered for a long time how the two halves could be so geologically different, and one theory suggests that, at some point in the distant past, the Earth actually had two moons, for a period of around 80 million years, before they got caught in each other's gravity and crashed together -- presumably while drunk.

#2. Massive Asteroid Impacts Created Iron Rain

These huge impacts created enough heat to vaporize metal, such as iron, gold, and platinum, which would have ascended into the atmosphere as a kind of metal vapor. And since what goes up has to come down, the early Earth would have experienced metal rain.

#1. Life May Have Originated On Mars

Billions of years ago, the environment on Mars was actually more hospitable than Earth. Life required a large amount of oxygen to form, but oxygen was relatively scarce here. It was plentiful on Mars. On top of that, life required the elements molybdenum and boron, of which there was also a whole heap on Mars, but not so much on Earth.

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