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Where does life on Earth come from? From ancient times to the present, people have never given up exploring and thinking about the question of where they come from.
in Eastern mythology Nuwa creates human beings, and God creates human beings in Western mythology have proved that in ancient times, human beings were exploring their own source of life.
The most widely known and recognized theory of human origin at this stage is of course the theory of natural evolution proposed by Darwin , which is the endogenous theory of " origin of life on the earth".
However, with the further exploration of space by humans, more and more scientists have raised doubts about this theory.
detected alive bacteria on the outer space vehicle that returned from the moon, proving the possibility of simple microorganism living in space; organic matter found on meteorite that fell to Earth from outer space made some people who believe in "exogenic theory" even more excited.
Perhaps, life on Earth really originated from the fall of a meteorite carrying alien life?
Dantils of the universe
A gust of wind blew, and the seeds of the dandelion left the mother plant one after another. They flew around with the breeze, falling randomly on a piece of land, and then took root and sprouted to open a new round of life.
This is the most familiar scene of dandelions scattering seeds.
Let’s imagine that more than one billion years ago, there was a planet outside the solar system, which was like a dandelion full of seeds.
With the explosion of this planet, countless pieces of life on the planet entered space and floated around.
After billions of years, the solar system was formed, and some planet fragments with living bodies floated near the earth, fell to the earth under the attractions of the earth's gravity, and turned into meteorites.
These meteorites are like the seeds of dandelions. The life they carry has found a suitable growth environment on the earth, so they slowly took root. After billions of years of reproduction and evolution, the earth has become a vibrant scene today.
The original origin of life on Earth comes from outer space, which is the most basic belief of those who believe in "exogenic theory".
Life in the universe
So does extraterrestrial life really exist in the universe? Decades ago, human aviation technology was limited, and extraterrestrial life could only be used through speculation and fantasy.
However, with the development of aviation technology, more and more aircraft have entered space, and even more and more astronauts have achieved long-term survival in space. The concepts of extraterrestrial life and aliens, such as distant places, seem to be beginning to become clearer.
Of course, as of now, the moon that humans have been involved in and the Mars that have landed in the aircraft have been initially confirmed that no aliens have been detected, which seems to further confirm the "endogenic theory".
Most scientists believe that life cannot exist in extremely harsh environments in the universe, such as vacuum, high radiation, extreme temperatures, etc.
As we all know, astronauts must wear professional space suits when entering the outer space to completely isolate the outer space environment. If you are not careful, the astronaut will lose his life in an instant.
However, because human body structure is complex, it has high requirements for the external environment. What if we turn our attention to "microbials"? Is outer space still dead silent? In fact, scientists found that it was not.
microorganisms are simple in structure, some are just a cell or even a chromosome, and their ability to keep them alive is far beyond our imagination.
is like the very ordinary "spores" on the earth. When encountering harsh environments, they can choose to dehydrate, hibernate, actively stop all metabolism , and wait until they encounter the right environment to survive.These microorganisms with super vital strength also have their own ways to deal with the extreme environments in outer space.
In recent years, scientists have discovered "bacteria" that live in space more than once on our spacecraft and space equipment.
Whether these bacteria were brought on earth or attached to devices in outer space, it at least proves that some life can indeed survive in outer space.
Magical meteorite
If there is really life in the universe, even if it is just the simplest microorganisms or organic matter, how did they come to the earth? People with exogenous theory believe that the most likely way for these extraterrestrial lives is to come to Earth with "meteorites".
In the early stages of the formation of the solar system, there was a very chaotic "big bombing period" because the entire solar system structure was not stable.
During this period, the sun and the various planets and satellite in the solar system were hit extremely frequently. For example, the dense craters that humans saw when they landed on the moon were caused by this period.
Earth, as a member of the solar system, also experienced a great bombardment of the universe. But in the long years that followed, due to geological activities and life activities, there was no pothole like the moon.
Under such dense bombardment of outer space meteorites, has a meteorite ever brought an alien life to the earth and planted the source of life on earth?
If we can't confirm anything from meteorites that have been too long, will the fresh freshly dropped meteorites be more convincing?
More than fifty years ago, near Melbourne, Australia, a bright trace of light shone across the night sky one night.
A few dozen seconds later, people heard a loud bang, and countless meteorite fragments flew across a radius of five kilometers. And in this, a small stone weighing about 680 grams brought new surprises to people.
After decades of research, scientists first confirmed that the lifespan of this meteorite is 7 billion years, which is older than the age of the earth. What's more important about
is that more than 14,000 organic molecules were found on this meteorite, including hundreds of organic matter that constitute life, including amino acid , purine and pyrimidine . You should know that these substances can be said to be the most primitive components of life.
Of course, some people suspect that this meteorite was collected by scientists after it fell on Earth. So are the organic matter on it originally from Earth?
scientists also made a demonstration on this. First of all, although there are many organic matter on it, there are two types of serine and threonine and threonine that have not been found. These two amino acids are widely present on the earth. If the organic matter in it originated from the earth, how could there be fewer the most common two?
In addition, scientists have also confirmed that many organic matter discoveries are inside meteorites and are not polluted by the earth.
In fact, in addition to the discovery of organic matter on this meteorite, scientists have also found fossils of bacteria and traces of water flow erosion on other meteorites from Mars.
All signs indicate that the Earth is likely not the only planet with signs of life, and life on Earth is also entirely possible that it is derived from meteorites billions of years ago. What is the truth of
? It may only depend on the further development of science. When humans can truly have mature technology to walk out of the solar system, they may be closer to the answer.
