In the five days of the world, hundreds of scientists from all over the world will try to prevent an asteroid from hitting the Earth, of course, the incoming asteroid is only a topic, not a real thing.
So, is there a way for humans today to save Earth from the threat of asteroids? Let's put it this way, although at this stage, human beings are not sure to be harmless in dealing with the asteroid threat, but it can definitely save mankind from extinction. So what if it's not an asteroid that's coming, it's a giant planet? Giant planets and asteroids are not a level of things at all, usually we call asteroids are tens of meters to hundreds of meters in diameter, once thought to be a threat to the Earth Destroyer is about 400 meters in diameter.
If a giant planet is likened to a watermelon, then an asteroid is not even a sesame seed.
There are 8 planets in the solar system, and the four closest to the sun are rocky planets, namely Mercury, Venus, Earth and Mars, of which Earth is the largest, reaching a diameter of 12740 kilometers, but the Earth is still far from the giant planet. Who are the giant planets? It is the four planets on the periphery of the solar system, Jupiter, Saturn, Uranus and Neptune, of which Uranus and Neptune are ice giants, while Jupiter and Saturn are the larger gas giants, of which Jupiter has the largest mass and volume. There is no doubt that Jupiter is a typical giant planet, its mass is more than 2 times that of the remaining seven planets combined, and if compared with Earth, it has a mass of 318 times that of Earth, and its volume is more than 1300 times that of Earth.
If Jupiter is likened to a watermelon, then the earth is probably a grape, oh no, a raisin.
Obviously, if such a huge giant planet crashes into the earth, it will inevitably engulf the earth, and it is necessary to say that the living beings on the earth, that is, the earth itself will no longer exist. So, if we could have learned a hundred years in advance that a giant planet was coming at Earth, would humanity have survived? Neither Jupiter nor Saturn, nor Uranus nor Neptune will crash into Earth, because they all have their own stable orbits, operating stably under the gravitational pull of the Sun. But in the universe, not all planets have stable orbits, and some planets have left their original orbits for various reasons, floating in the universe and becoming a wandering planet.
There are many wandering planets in the universe, and it is not impossible to have an eyeless rush to the earth, but fortunately, giant planets are very large, so we can easily find it, and it is not a problem to advance a hundred years.
The problem is that 100 years in advance is actually too late. Planets in the universe have different speeds, such as the earth's orbital speed of about 29.8 kilometers per second, while in the universe, some planets can travel tens of thousands of kilometers per second, or even hundreds of thousands of kilometers. Even if a planet of 200,000 kilometers per second is coming towards Earth, a year earlier discovery means that the planet has entered the solar system, because the radius of the solar system is 1 light-year long. What should we do at this point? It is impossible to change the trajectory of a giant planet with the current human technology, so we can only run.
Where to go? Other planets in the solar system?
There are no habitable planets other than Earth in the solar system, of course, we can first concentrate global forces to build a base on Mars, and relocate a small number of people to this base, leaving a spark of hope for the continuation of human civilization. Although this is not an easy task with the existing human capabilities, it can still be completed in a hundred years if resources can be concentrated. Unfortunately, even if we did, it wouldn't be of much use. It is indeed a terrible thing for a giant planet to hit Earth, but even if it does not collide with Earth, its invasion of the solar system itself is already a terrible thing, because the intrusion of a giant planet will completely disrupt the gravitational structure of the solar system.
The solar system was not as stable and orderly as it is now from the beginning.
It has gone through countless planetary impacts and mergers to achieve what it is now. If a giant planet breaks into the solar system, it will make the solar system chaotic again. Smaller celestial bodies will be the first to deorbit and crash into other planets, so before the giant planet is approaching, the earth may rain meteorites, and more frighteningly, the other planets will also be chaotic, so the giant planet has not yet collided, the earth may collide with Mars. After the entire solar system has become chaotic, it is impossible to determine where it is safe, so even if a base is established on other planets, humanity will not be spared. Fortunately, all this is just a hypothesis, humanity still has enough time to realize its interstellar dream, and maybe one day we can really leave the solar system.