What was the Earth like 4.6 billion years ago, and when did the first cell appear?

Since the birth of the universe 13.7 billion years ago, and then the emergence of various planetary star systems, and our Earth only began to form about 4.6 billion years ago, what did the Earth look like at that time?

The Earth was fully formed about 4.5 billion years ago, the first geological epoch, known as the Plutozoic Epoch. At this time, our sun is still very young, the sunlight is very weak, the moon has not yet been born, but in the dark night sky, you can see countless stars moving, these are comets, asteroids and primordial planets in the solar system, they are all over the solar system, very chaotic. Occasionally, you can see meteorites in the sky dragging their flaming flame tails across the night sky.

This era is not suitable for the birth of life, and it will take a long time for even the air that living beings breathe to appear. The most important thing is that the earth's crust is not yet fully formed, and a large part of the ground is a sea of magma, although it is said that there may have been water puddles on the earth at this time. Because of the very high atmospheric pressure, the water does not evaporate, but remains in a liquid state, but where this water comes from has been debated by scientists, some believe that comets brought it from the Alt cloud, others believe that water was contained in matter when the earth was formed.

Scientists believe that the first living cells appeared 4.1 billion years ago. Three billion years ago, the Earth was in the middle of the Archean period, when there were already very shallow but warm oceans on the planet, which were much hotter than today's seawater because of volcanoes everywhere. The warm waters of the sea encouraged primitive life to begin to thrive on the ocean floor, and their outer appearance resembled membranous cells and green mucus.

It is a complex ecosystem with many different species of bacteria, commonly known as microbial mats. Each microbial mat is a closed ecosystem and is very stable. But on land it was bleak, with no plants, not even soil, to be exact.

At that time, the largest land mass was called Wabala, and it was also the first supercontinent that theoretically existed on Earth, but when there were only rocks on this continent, there were raging winds and huge waves hundreds of meters high, mainly because the moon was very close to us at that time, and its power has been affecting our earth. Later, the Earth's tectonic plates moved, volcanoes became more active, and continental crusts began to slowly form, increasing the area of land several times over a period of hundreds of millions of years.

The earth is very barren, with almost no water, and the first cell is supposed to be paramecium, which is in 620,000 BC.

It's dark, there's not much light to speak of, and you can see that most of it is water, and the cells appeared 10 years after the birth of the earth.

There are many trees, and there is also a lot of grass. People may generally say that it appeared 500 million years ago.

Therefore, the appearance of the first cell on the earth is very coincidental, but the emergence of cells under the accumulation and precipitation of time is also the inevitable creation of life by nature

The Earth itself is a very coincidental planet

It is just rich in water, oxygen and a temperature suitable for the survival of organisms, as the only planet in the solar system that is not close to the sun, so that its temperature is at a reasonable and suitable temperature, so far human beings have not found a planet that can give birth to other life, so human beings are lonely. But there are many people who believe that there must be a planet with life countless light years away, just as it is accidental and inevitable that the first cell will appear on the earth, and there must be another planet in the infinite universe that is also full of coincidences and suitable for life.

The first cell is evolved from ribonucleic RNA metabolism, and from a biological point of view, all kinds of life substances are evolved from some biological macromolecular RNA, which mainly includes cells.

It is believed that the emergence of the first cell on Earth was due to a combination of different chemical reactions in the early days, and its genetic material was RNA, through which proteins were synthesized directly.

The first cells on Earth were produced by self-replicating RNA surrounded by a membrane composed of phospholipids. Phospholipids are an essential component of modern biofilms, including those of prokaryotic and eukaryotic cells.

Prokaryotic cells appeared on Earth about 3.5 billion years ago <> about 1,214 billion years ago. Prokaryotic cells are the cells that make up prokaryotes. The main characteristic of this type of cell is that there is no nucleus bounded by the nuclear membrane, and there is no nucleolus, only nucleoid.

Evolutionary status is low. Organelles have only ribosomes, have cell membranes, and are different in composition from eukaryotic cells. The cells are small, there are no formed cells, there are no chromosomes, and DNA does not bind to proteins.

Prokaryotic cells do not have a nuclear membrane, and the paragenetic void is concentrated in a region of low electron density with no clear boundaries.

Summary. The determination of the age of the Earth relies mainly on uranium-lead dating. The uranium-238 (238U) and uranium-235 (235U) isotopes undergo a series of decays to eventually convert to lead-206 (206pb) and lead-207 (207pb).

Measuring the ratio of these isotopes can help scientists infer when rocks and minerals were formed. By dating the oldest rocks on Earth and lunar rocks, as well as meteorites, scientists found that they were about 4.6 billion years old, so it is inferred that the Earth was formed about 4.6 billion years ago.

Hello, scientists measure and infer the macro and state ages of the Earth through a variety of methods, among which radiometric dating is one of the most commonly used and reliable methods.

Specifically, the main way to measure the age of the Earth is through the radioisotope analysis of rocky clumps of the Earth and the Moon, as well as meteorites. Radioisotope dating is based on the principle of radioactive decay. Isotopes of certain elements spontaneously decay into other elements, a process that has a fixed rate called half-life.

By measuring the number of a radioactive isotope and the number of oranges produced by its decay, we can calculate the age of the sample.

The determination of the age of the Earth relies mainly on uranium-lead dating. The uranium-238 (238U) and uranium-235 (235U) isotopes undergo a series of decays and eventually transform into lead-206 (206 pb) and lead-207 (207 pb). Measuring the ratio of these isotopes can help scientists infer when rocks and minerals were formed.

By dating the oldest rocks on Earth and the moon rocks, as well as meteorites, scientists have found that they are about 4.6 billion years old, so they deduce that the Earth was formed about 4.6 billion years ago.

Dear, do you still have any doubts about this question<>

On the scientific side, I know that there is a kind of industry side year that is how many times more advanced than you said.

Hello, radioisotope dating is currently recognized as an accurate and reliable way to measure the age of the Earth and other celestial bodies.

It would be inappropriate to say that there is a method that is many times more advanced than radiometric megatope dating. Because in the field of earth science, various methods have their scope and limitations, and different methods are usually aimed at different problems and research objects.

Based on the determination of the decay rate of radioactive materials on Earth, it is known that our Earth has existed for 4.6 billion years, that is, our Earth was born 4.6 billion years ago.

In 1896, uranium, a natural radioactive element, was discovered in Berquerel, France. In 1905, it was discovered that the rock had radioactive characteristics. Later, through further research, it was found that the specific age of the rock could be determined based on the rate of metamorphosis of the radioactive elements in the rock.

For example, the uranium-lead method can be used to determine the actual age of rock formation. Because one gram of uranium (U235) will always fission into lead and helium in a year, the age of the rock can be calculated as long as we sample the rock according to certain requirements and determine the ratio of the radioactive elements uranium (U235) to lead (PB237) in the rock with special instruments. This method is called isotope age mapping.

Isotopic age is also called absolute age. In addition, the age of the rock can also be measured by using the rubidium-strontium method, the potassium-argon method, the C14 method, etc. In comparison, it is more desirable to use the uranium-lead method to measure very old rocks.

Through the above methods, the ancient rocks of the original crust are calculated, and the ancient rocks on the earth are generally not less than 3.6 billion 3.7 billion years old. Up to 4 billion years.

In addition, because the age of the earth at the time of formation is similar to the age of the solar system, "the stones of other mountains can be used to attack jade", scientists use some meteorites that fell on the earth and lunar rocks (soil) collected from the moon, after measurement, and the age of the oldest rock on the earth, the age of the earth can be deduced, about 4.6 billion years. For example, the age of the Jilin meteorite is 4.7 billion years old by rubidium-strontium method. The material that makes up the Jilin meteorite was separated from the Sun's primordial nebula 4.7 billion years ago, so it is a little older than the age of the Earth when it was formed.

At present, it is generally limited to 4.6 billion years, and the period since the beginning of the paleocravid in 4.6 billion years is the geological time of the earth, also known as the paleogeographic sphere period; The period 4.6 billion years ago is called the "astronomical period", also known as the "pre-geological period".

Everyone should know that the earth has been born for more than 4.6 billion years, and human civilization is only a few thousand years, and even the origin of human beings is only a few hundred thousand years old, which is just a drop in the ocean compared to the age of the earth. So how did human beings, who have only a few thousand years of civilization or even only a few hundred years of modern civilization, know that the earth is 4.6 billion years old?

In 1956, scientist Patterson used the U-PB isotope to calculate the age of the earth as 100 million years, which was the first time that humans measured the age of the earth. Later, in order to continue to confirm the final age of the earth, human beings continued to explore, and finally confirmed that the final age of the earth is 100 million years, which is very close to the answer of scientist Patterson. In addition, the discovery of 4.2 billion years ago Canadian Acasta Gneiss rock and 4.4 billion years ago debris of a zircon has confirmed that the earth has indeed lived for more than 4 billion years.

Later, in order to reconfirm the age of the earth, scientists used the decay of tungsten 182 and hafnium 182 to calculate the age of the earth, and the half-life of hafnium 182 was 9 million years, and after the decay, it became hafnium 182. There are only a small amount of hafnium-182 on Earth, and it is these small amounts of Hafnium-182 that have led scientists to calculate that the true age of the Earth is 4.6 billion years. According to scientists' estimates, it takes 6 billion years for all tungsten-182 on the earth to decay into hafnium-182, and there is still a small amount of hafnium-182 on the earth, indicating that the earth's hafnium-182 has not completely decayed, so the age of the earth is finally confirmed. 

What was the Earth like 4.6 billion years ago? Scientist: The ocean has been born, but it is thicker than glue.

The history of the earth is recorded on the rocks. For example, the Grand Canyon of Colorado, where the rock walls have been severely eroded by flowing water, can witness the formation of rock formations over millions of years. The rocks that formed early were generally in the lower layers, and they served as a basis for geologists to study the process of crustal formation.

Until a suitable dating method is found, the measurement of the earth's age contains more estimated components, such as climatology, sedimentation, paleontology, salinity, etc., but the results obtained by these methods are not the same. It was not until the forties and fifties of the 20th century that scientists used the lead isotope method to measure and came to a unanimous conclusion that the age of the earth was about 4.6 billion years.

It can be known by analyzing the isotope ratio of elements in rock formations. Many elemental isotopes have half-lives. Not to mark the age of the rock formation.

What terrible creatures have existed on Earth since ancient times?

What terrible creatures have existed on Earth since ancient times?