Humans migrated to dinosaurs.

The earth's 4.6 billion-year history can be divided into Phanerozoic, Archean, Proterozoic and Phanerozoic, and Phanerozoic can be subdivided into Paleozoic, Mesozoic and Cenozoic. Mesozoic can be divided into Triassic, Jurassic and Cretaceous. Dinosaurs are reptiles that lived in Mesozoic, about 240 million to 75 million years ago. Paleontologists have found that there are more than 1000 species of dinosaur family members, almost all over the entire ecosystem, including land, sea, air, large, medium and small.

The dinosaur family developed reptiles to the peak, but it evolved for 65.438+0.6 billion years. In the end, it didn't develop an intelligent civilization. Facing the impact of extraterrestrial objects, it is doomed to be destroyed by "hand-to-hand combat". This is a natural disaster of dinosaurs and there is no way to face it. An asteroid with a diameter of 10 km hit the earth. If we are human beings to experience, according to the current level of science and technology, we will do nothing, because there is no way to deal with it.

Let's take a look at the road of human evolution and development. The extinction of dinosaurs gave mammals a chance to breathe. About150,000 years ago, forest apes came out of the trees and came to the grassland, completely separated from the ancestors of modern apes. With the development and evolution, human beings walk upright, learn to use tools, and cooperate in hunting life. About 3 million to 5 million years ago, they began to thrive on the African continent.

For the first time, human beings went out of Africa and developed different races around the world, such as Neanderthals, Homo erectus and Thoreau, but they did not go out of Africa to develop Rudolph, craftsmen and Homo sapiens (ancestors of modern humans). Homo sapiens went out of the African continent for the second time and went to the whole world, and finally flourished. All other races were extinct, and only Homo sapiens survived and developed into modern people today.

It can be said that mankind has stumbled to this day, but it has not encountered a particularly serious "natural disaster", because millions of years is still too short, and it is completely insignificant compared with some biological history that has lasted for hundreds of millions of years. The advantage of mankind lies in the development of intelligent civilization and various "tools" in a short time.

The threat to human civilization comes from three aspects: the first is man-made disaster. We destroy the ecological environment at will, and eventually we can't fully recover, and we also bring trouble to other creatures. Or get hot-headed, trigger a global nuclear war, and send yourself back to the Stone Age; Second, natural disasters, the simplest of which are celestial impact, super earthquake, super volcanic eruption, super virus and alien civilization invasion; The third is the arrival of the end of the solar system. For example, the sun entered the red giant era and swallowed up the earth. The collision and fusion of the Milky Way and Andromeda caused other stars to be close to the solar system, which eventually disrupted the comet base camp of Oort Cloud, and a large number of comets hit the eight planetary regions.

All of the above are possible incentives to end human civilization. After the farthest three or four billion years, the latest one is hard to say.

Text/science black hole, image source network intrusion.