On December 21, 2012, humanity on Earth spent the day peacefully, and the doomsday predicted by the Maya civilization did not happen.
Where did the end of the world 2012 come from?
In the 18th 30s, Americans first discovered the ruins of the Mayan civilization in Central America, and after being visited by archaeologists from many countries, the Mayan civilization reappeared in the sky, and what is striking is the prophecy that records the future of the world in the site, called the Mayan prophecy. Maya prophesied that the Earth would reach its end on December 22, 2012, the Sun would disappear and the world would fall into darkness.
The doomsday scene did not happen.
But
Is the earth on which we live really safe?
solar system
The mainstream thinking in the field of science believes that our universe was born in a big bang, the big bang produced gas and dust, under the action of gravity, dust and other matter gathered, forming stars, planets, nebulae and other matter.
There are eight planets in the solar system, and the Earth is one of them, and under the action of gravity, the eight planets rotate rapidly around the sun. In addition to the eight planets, there are countless asteroids that are also moving at high speed.
Some asteroids are attracted by the Earth to crash into the Earth as meteorites, most of which are very small, and these meteorites burn in friction with the atmosphere, turning into meteors, and when they reach the ground, they can no longer harm the Earth.
meteor
So what happens to a large object crashing into Earth?
In June 1908, a celestial object about 50 meters in diameter (also known as 20 meters) struck the Siberian Plain (near the Tunguska River in present-day Russia), causing tens of millions of trees to be burned.
Fortunately, the area is sparsely populated, and there were no casualties in the impact of the small object on the earth. After investigation by scientists, 3 explosion craters of hundreds of meters were found at the site of the explosion, 2,000 square kilometers of forest were knocked down, nearly 300,000 trees were killed by radiation, the soil of the explosion was magnetized, some trees were radioactive, and some animals were genetically mutated.
It is estimated that the energy generated by the impact of the celestial body on the earth is equivalent to 1,000 times that of the atomic bomb dropped by the United States on Hiroshima in Japan.
Scientists have calculated that if a meteorite hitting the Siberian plains landed in Europe, the result would be the loss of at least 1 million people.
The celestial impact on the Earth was the Tunguska Explosion, which was painted with mystery by the world.
Another widely publicized celestial impact on Earth had disastrous consequences for Earth's living things.
About 65 million years ago, an asteroid about 10 kilometers in diameter hit Earth, followed by a big bang, and dust entered the atmosphere. The sun was blocked from direct access to the surface for months, and the earth fell into darkness and cold. In the midst of hunger and cold, the dinosaurs went extinct and withdrew from the stage of earth's history forever.
meteorite
In 2004, an American astronaut warned NASA that an asteroid could hit Earth and cause disaster. Through observation and calculation, an asteroid called Apophis will pass by Earth on April 13, 2029.
The asteroid Apophis, which will skim over The Earth in 2029 is about 450 meters in diameter, and on April 13, 2029, it will pass by the Earth, and if the distance is close enough to the Earth, Apophis will be affected by the Earth's gravity to change the direction of orbit, and on April 13, 2036, Apophis will likely crash into the Earth.
It is predicted that Apophis will hit the eastern Pacific Ocean, and it will stir up a deep crater in the sea, which will reach a depth of more than 2,000 meters, causing a huge tsunami, forming waves as high as 15 meters, and coastal cities will suffer catastrophic blows.
However, after years of tracking observations of Apophis, the possibility of Apophis hitting Earth in 2036 has been ruled out, but Apophis will be close to Earth on April 13, 2029, and you can even observe it with the naked eye.
Do you think that only small bodies threaten the safety of the earth?
Gamma-ray bursts
Gamma-ray bursts – another substance that could destroy life on Earth. Large stars (glowing objects, such as the Sun) may produce gamma-ray bursts when they die, which are beams of light containing extremely high energy and have high penetration that can directly penetrate cells and cause fatal damage to living things.
If a gamma-ray burst occurs closer to Earth, it will destroy the ozone layer and make the ozone layer disappear, and the glare of the gamma-ray burst will burn organisms, decompose biomolecules, and a large area of acid rain will fall in the sky, and plants will be incinerated, eventually affecting global life.
red giant
The Sun Expands – a fatal injury from a friend. The sun is constantly burning, it produces the sunlight on which life on Earth depends, but the sun's fuel will one day run out, and this process will be accompanied by the continuous expansion of the sun, which will expand tens or hundreds of times to become a red giant.
Too large a volume makes the sun continue to approach the earth, the earth's temperature will rise, the ozone layer will disappear, all the liquid will be evaporated, the rock will be melted by the high temperature, and the earth will become a lava ball.
Eventually, the Earth will be swallowed up by the sun, but this process will be 5 billion years from now, and now humans don't have to worry about it, because humans may not be able to continue until 5 billion years later.
tear
The Great Rift – The Ultimate Destiny of the Universe. American physicist Robert Cardwell made the idea of the Great Tear of the Universe through observation and computation. The universe is expanding, and it's accelerating.
At that time, all the stars will be far away from us, the earth will be peeled off layer by layer, and the individual living beings will be torn apart into countless molecules. However, according to the "great tear" theory, all this may happen 50 billion years later.
Everyone who comes into the world is unique, and no one can replace it.
The world did not have you before you were born, and after you die, the world will no longer have you.
Please cherish who you are now and everything you love.