Have so many stars, planets, meteorites and space junk in the universe ever hit the earth? Why?

The earth has been hit many times in history, but it has never been hit by a star. This star is also a monster to the earth. It knocked the earth unconscious at once. Although there are many stars, this is not the scene at the beginning of the universe, and the probability of collision is too small, even if it happens, it may not be observed. First of all, it needs to be clear that there is a huge relative distance between stars, galaxies and clusters. Stars in the universe are usually as lonely as the sun, and the other is a binary star system, both of which are common in the observed universe.

There have been many asteroid impacts in the history of the earth, and the huge craters all over the earth can illustrate this point. Planets generally have a large mass, their orbits will not change easily, and the possibility of hitting the earth is very weak. Asteroids and periodic comets are greatly influenced by planetary gravity because of their small mass. When passing through the earth, their orbits will change, and if they go on for a long time, they may hit the earth.

According to the number of stars, there is still the possibility of hitting stars, but it is too difficult to find. There is a time difference when humans observe the stars in the universe, and it is very difficult to find specific celestial activities. You don't have to see what you want to observe. With the positive development, many other celestial bodies will be discovered, and star collisions may occur here.

The outer space of the earth is full of space junk. Some of them gradually slowed down and fell to the earth due to the influence of the thin atmosphere outside the earth, while others accelerated to fly to a higher orbit because of the impact.

As for the collision between stars and the earth, it never happened. The smallest star is about the size of Jupiter, and its mass is more than 80 times that of Jupiter and more than 20,000 times that of the Earth. If you hit the earth, the earth will blend into the stars. Planets are also massive, and if they collide, it will lead to the division of the earth. It is speculated that there was a large-scale collision in the history of the earth, and the fragments of the collision gathered to form the moon.