When did the sun eat the earth?

Destruction of the Earth: The history of human beings can be traced back millions of years, while the history of the true conquest of nature is only a few thousand years, and the gradual development of human civilization is nearly two thousand years. So how long can humans live on Earth?

Is there an answer now?It's safe to say that there is an answer now, it's about 1.1 billion years.

According to the research of modern astronomy, the lifespan of stars similar to the size of the sun in the universe is generally about 10 billion years, and the sun has existed for 4.5 billion to 5 billion years. Writing this, many people will say that if there is a sun, there can be human beings, then the earth still has 5 billion years to live. Actually, if you think simply, an elderly person must be completely healthy and free of diseases

No way. The same goes for the sun. With the depletion of hydrogen, the sun will be more unstable in early old age, when no one can guarantee that the sun will not change suddenlyYou must know that many small changes in the sun pose a very big threat to human beings, such as sunspot eruptions, solar wind, magnetic storms, and so on.

Therefore, it is accurate to calculate that human beings can still exist under the protection of the sun for about 1.1 billion years.

Reason: After 5 billion years, after the sun's hydrogen element is completely depleted, the sun will expand first, and the boundary will be close to the earth, which will completely engulf Mercury and Venus. At this time, the sun is called a red giant, and it is very hot, completely evaporating the water from the earth.

Without water, life generally does not exist;Without water, the temperature of the earth is also very high.

The Sun then shrinks into a white dwarf. At this time, the temperature of the sun is very low, and the temperature of the earth will also be close to absolute zero. It is impossible for life to exist.

So, humanity still has 1.1 billion years to find another habitable planet. Such a long time is enough. In a few hundred years, mankind should have deciphered the theory of the nature of physics (i.e., understanding the nature of matter in the world and the laws of interaction between matter).

At that point, traveling in space would be a breeze.

5 billion years later, when the Sun becomes a red giant.

It will take about 5 billion years for the Sun to become a red giant, begin to expand, and eventually engulf the Earth.

The sun will not eat the earth, and the sun will not be reluctant to the earth.

Become the 7193rd fan.

The Sun is the closest star to Earth and is the central body of the solar system. The mass of the solar system is concentrated in the sun, and its strong gravitational pull controls the movement of celestial bodies such as large and small planets and comets.

It has given birth to the civilization of the earth and has always influenced the life of the earth. It is the only star whose surface structure can be studied in detail and is a huge astrophysics laboratory.

But the Sun is just an ordinary member of the 100 billion constant excitation missing omen stars in the Milky Way, located near the symmetry plane of the Milky Way, about 33,000 light-years from the center of the Milky Way and about 26 light-years north of the galactic plane, on the one hand, it rotates at a speed of 250 kilometers per second around the galactic center, and on the other hand, it moves at a speed of kilometers per second relative to the surrounding stars in the direction of Vega.

Extended Materials. The evolution of the sun.

The Sun was formed about 100 million years ago in a cloud of collapsed hydrogen molecules. The time of the formation of the Sun is measured in two ways: the current age of the Sun in the main sequence of the Ming Lease, confirmed using computer models of stellar evolution and primordial nucleus, which is about 100 million years.

This is very consistent with the radioactive dating of the oldest material of the sun is 100 million years old. The Sun has reached middle age in the evolutionary phase of its main sequence, in which nuclear fusion is the fusion of hydrogen into helium at the core.

More than 4 million tons of matter are converted into energy in the Sun's core every second, producing neutrinos and solar radiation. At this rate, the Sun has so far converted about 100 Earth-masses of matter into energy, and the total time spent by the Sun in the main sequence is about 10 billion years.

The sun did not expand dramatically.

All stars have been expanding since the day they were born, but in the main-sequence phase, this expansion is so slow that it is barely noticeable.

The Sun has also been expanding slowly since its birth about 5 billion years ago, and by now it has increased by about 12% to 13% in diameter. As the sun expands, its surface temperature slowly decreases, so the total amount of radiation received by the Earth remains largely unchanged.

The Sun is still a main-sequence star, and at the current rate of expansion, it will expand slowly for about 5 billion years. During this time, there will be no major changes in the Earth's surface environment.

After 5 billion years, the Sun will leave the main-sequence phase. It will then expand dramatically and in 51 billion years, near the Earth's orbit, and one day engulf the Earth.

But that day is still far away.

In 4 billion years, it will evolve into a red giant and devour the Earth.

Wait for more than 4 billion years for the sun to swell.

No, the sun will be **4.6 billion years from now.

The distance between the Sun and the Earth is 150 million kilometers. Watching the sun shine on the earth every day, do you think about how long the sun's rays need to travel in space before they reach the earth?

The speed of light is about 300,000 kilometers per second, so we can use the kinematic formula learned in China to calculate the time it takes for sunlight to travel from the Sun to the Earth.

Formula: t=s v so we get.

15000000km (300000km s) = 500 seconds 8 minutes 20 seconds.

From the above calculations, we can see that it takes 8 minutes and 20 seconds for light to reach the Earth. And in addition, this number also means that the sun that we see above the earth is not"Now"The sun, but the sun 8 minutes and 20 seconds ago!

Therefore, if the aliens break the sun, we who live on the earth and lie on the beach to bask in the sun can still enjoy the sun's rays for 8 minutes and 20 seconds, only to find that the sun has disappeared.

How long does it take for sunlight to reach Earth?

The distance between the Sun and the Earth is actually 150 million kilometers. The speed of light is about 300,000 kilometers per second, and the kinematic formula is used to calculate the time it takes for sunlight to travel from the sun to the earth.

Formula: t=s v hence the result.

15000000km (300000km s) = 493 seconds 8 minutes and 13 seconds From the above calculations, it takes 8 minutes and 20 seconds to get the light to reach the earth.

According to a study by the University of Warwick in the United Kingdom, it is true that the sun expands and swallows the Earth, but at least for 6 billion years, the sun's life will not come to an end.

That is to say, the life span of the sun is at least 6 billion years, and the sun is a yellow dwarf (spectrum G2V), and the life span of the yellow dwarf is about 10 billion years, so the life of the sun is still about 4 billion years at most, which is the life of the sun.

As long as the sun exists and the earth is not swallowed, then the earth's civilization will continue to continue, spanning at least 6 billion years, which is a fact that can be explained by science.

A 2008 study showed that when the Sun enters its red giant phase, its radius will become extremely large, reaching almost 100 million kilometers in its outermost layer, engulfing Mercury, Venus, and Earth. It takes about 5 million years for the Sun to complete its transformation into a red giant, which is almost instantaneous compared to the lifetime of a star.

In addition, the luminosity of the sun has been increasing at a rate of about 10% per billion years. As a result, the extent of the so-called "habitable zone" around the Sun will gradually change. The so-called habitable zone refers to the area where the distance around the star is moderate, so its surface temperature is relatively moderate, allowing water to exist on the surface of the planet in liquid form, and the current habitable zone range of the solar system is roughly between the distance from the sun in astronomical units (au).

As the luminosity of the sun rises, this area will gradually move outward. When the Sun eventually became a red giant, Mars was already in the habitable zone long before that. At the same time, the Earth will be so close to the Sun that it will dry up under the increasing heat of the sun, the oceans will evaporate, and the water molecules will be broken down into oxygen and hydrogen by ultraviolet rays and escape into space.