Why did Hawking predict that human beings would be less than 1000 years away from extinction?

I remember the last time the media said that stephen hawking predicted that mankind would be extinct in less than 200 years. How long has this delayed the fate of human extinction for 800 years? I hope the relevant departments will make persistent efforts and create new achievements!

In fact, it doesn't matter how many years humans can live. The main meaning is that the earth will eventually perish and must escape.

According to quite unreliable news, including the Daily Mail, which is often quoted in China, Hawking predicted that the earth will be destroyed within 200 years and human beings must flee! Recently, stephen hawking said that the earth is in danger now. In addition to preventing aliens, there are also popular artificial intelligence robots. Ultimately, it is important that the current area is not enough to support human survival. Now the earth is like a dangerous building, crumbling and may be destroyed at any time. The only way out for mankind is to escape. "

It doesn't matter whether Hawking said this statement about the destruction of the earth. Let's talk about the destruction of the earth and how to destroy it.

The earth has existed for about 4.5 billion years, 4.5 billion years. What is this concept? Draw these 4.5 billion years as a straight line, and the time of human existence is only a point on this straight line. Humans are really insignificant in the history of the earth. In these 4.5 billion years, all kinds of creatures have been born, but these creatures are just passers-by in the life of the earth, just like dinosaurs that once dominated the earth.

Humans may eventually die, but the earth will not. Even if mankind dies, the earth will continue to exist. We often say that the destruction of the earth is basically the destruction of mankind. Even if the earth becomes Mars unsuitable for human survival, the earth still exists. The demise of mankind is very simple, so what can be done to make the earth perish? Death here means disappearing or becoming a fragment.

I think there are the following possibilities:

1, alien invasion

Like in Independence Day 2, the alien attack. They are not here to destroy mankind, they are here to destroy the earth. Alien spacecraft violently attacked the earth and forcibly inserted into the core. It's horrible to think about the consequences. Fortunately, the warriors once again defeated the arrogant aliens with personal heroism.

To be honest, if aliens really attack, I don't think humans have a chance at all. This must be the result of unilateral torture.

Step 2 be swallowed up by the sun

About 5 billion years later, the sun will enter the red giant stage. When the sun becomes a red giant, its radius will be about 200 times that of the present, and the surface may extend to the present earth orbit. When the sun becomes a star with an asymptotic giant branch, it has lost about 30% of its mass due to the stellar wind, so the earth's orbit will move outward. If so, the earth may survive, but new research shows that the earth may be swallowed up by the sun due to the interaction of tides. But even if the earth can escape the fate of being burned by the sun, the water on the earth will still boil and most of the gas will escape into space.

In Liu's novel The Wandering Earth, the sun is about to be destroyed. The sun, which has been the pillar of human spirit for countless years, suddenly becomes a symbol of death and terror. In order to escape from the solar system, a huge earth escape plan began to be implemented. And the man-made environment of ordinary size that human beings can create can't stand long-distance escape. Therefore, human beings have to install a huge earth engine on one side of the earth, turning the whole huge earth environment circle into an immigration ark, thus escaping from the solar system and going to a new home. (Quoted from the Introduction to The Moving Earth)

The cost of human escape from the solar system is very high. Countless lives have died in flight, and human ethics have been tested as never before. Many people lost their lives because of this incident. However, the final disappearance of the sun instantly calmed everything, and mankind finally embarked on a long journey of wandering with hope.

Maybe some people think that all the nuclear bombs on the earth will explode and the earth will be destroyed.

Not really.

Quote Zhihu's answer:

Earthquakes, tsunamis and volcanic eruptions that happen almost all the time are worse than nuclear weapons, and there is no such thing as a land king. Even an asteroid with a diameter of 10 km collided in present-day Mexico 65 million years ago, releasing energy several times higher than the sum of the energy released by the global nuclear weapons explosion, and did nothing to the earth (but the dinosaurs became extinct). In addition to killing human civilization, nuclear weapons can't even destroy the entire ecological circle, let alone destroy the king of the earth. (Author: Solution)

The Tunguska Big Bang is estimated to be about1000 ~ 20 million tons of TNT equivalent, equivalent to thousands of Hiroshima atomic bombs.

Tsar bomba Ivan 50 million tons of TNT equivalent, equivalent to more than three thousand Hiroshima atomic bombs.

1945- 1998 global nuclear test statistics The earth has been bombed by more than 2,000 nuclear bombs.

The dose of radioactive material leaked from Chernobyl in the Chernobyl nuclear accident is more than 400 times that of Hiroshima.

The nuclear winter nuclear winter hypothesis is not reliable, and it should be regarded as a scare for anti-war purposes.

See, even if thousands of nuclear bombs explode at the same time, as long as they are located in remote areas, they will not cause great harm to mankind. (Author: Lei Tuanzi)

There are many ways of human extinction, and the earth will exist for a long time. Could the earth be better without human beings?