When the gravitational source has a force on the object, because the distance from each point on the object to the gravitational source is unequal, the gravitational force is different, resulting in a gravitational difference and a tearing effect on the object, and this gravitational difference is the tidal force.

Amplifying this concept into the universe, tidal forces are ubiquitous.

When an object is massive enough, it is a source of gravity.

In space, whether it is the glowing sun, the blue star itself, or the moon revolving around the blue star, and many planets in the solar system, they are all sources of gravity.

However, tidal forces cannot normally tear an object apart, and the simplest example is the Blue Star itself.

The blue star itself is affected by the two gravitational sources of the moon and the sun, and the tidal phenomenon on the blue star is the embodiment of the tidal force, but the blue star itself is not torn apart by the gravitational pull of the sun and the moon.

But this time the meteorite that will hit the blue star is different.

First of all, it is not very large, but it is not small either, and after entering the Earth-Moon system, it is affected by the triple gravitational pull of the Moon, the Blue Star, and the Sun.

Originally, in terms of the strength of the meteorite itself, it would not be torn apart by the gravitational pull of the blue star, but who let it threaten the safety of the blue star, was punched and drilled, and then the center was blasted?

The nuclear bomb detonated by the Federalists on the meteorite did split the meteorite in two pieces, but it also destroyed the meteorite's original internal structure.

To put it simply, it was the nuclear bomb detonated by the Federation that not only blew the meteorite open, but also blew two parts of the explosion into cracks.

If you just leave it alone, then it's fine, but when the meteorite's trajectory gradually approaches the blue star, it is more and more affected by the gravitational pull of the blue star, and even simply captures it by the gravitational force of the blue star, the problem comes.

It's like a bed sheet, of course it can't be torn by three people in good condition, but when someone pokes a big hole in the middle of the sheet and tears the sheet into two, the remaining piece is pulled by three people together, and it is easy to tear the sheet along the broken place.

So in the same way, the already cracked meteorite is affected by the dual action of the gravitational pull of the blue star and the moon, coupled with the gravitational influence of the sun, under the triple force, the meteorite that originally had cracks was torn into three parts.

It doesn't matter if the meteorites are torn into three parts, if they continue to fly according to their previous orbits, it is nothing more than three meteorites grazing the blue star.

But the problem is that when the meteorite is torn apart, it splits into three parts and its weight is reduced, which makes all three meteorites capture by the gravitational pull of the blue star and fly towards the blue star.

This matter is a small thing on a cosmic scale, it is just a few meteorites, whether it is for the moon or the blue star, it is just an insignificant piece of dust.

In fact, there are dozens of tons to hundreds of tons of meteorites falling on the blue star every day, but most of them fall in uninhabited places or are burned out by the atmosphere before they land, and the number of meteorites that can really fall to the surface to form an impact is very small.

Therefore, the matter of meteorite impact, from the perspective of the universe, is really not a problem.

But to look at it from another angle, a meteorite impact is fatal.

Fortunately, modern human civilization has climbed to a certain level, and human beings have begun to set foot outside the home planet, and they also have a certain ability to withstand and defend against disasters of this magnitude, and they can more or less preserve a little fire of human civilization in the face of disasters.

But what if the meteorite impact occurred in the past, when human technology was not so advanced?

There is no need to push back too long, just two hundred years ago in the eighteenth century, if there was a meteorite impact of the current scale, then human civilization could be like the dinosaurs, with both hands off the keyboard and typing GG.

Because with the level of technology in the steam age two hundred years ago, it was simply unable to deal with such a disaster, and it was impossible to even dig a shelter to take refuge.

However, even though modern human civilization has gradually begun to have the strength to deal with such disasters, our ability to deal with disasters is still limited.

The rescue operation that gathered almost all the resources on the blue star was almost half successful, but now the meteorite that should have been pushed away from the impact orbit was not only pulled back by the gravity of the blue star, but also split into three pieces, which undoubtedly made the leaders of all countries who knew about this matter instantly full of blood pressure and their heartbeats jumped to 120.

We haven't done a four-kilometer one, and now there are three more five-kilometer ones, and all the previous efforts are all huge, and the crisis that mankind has to face has not been alleviated at all, but has become more serious.

In the face of this situation, the leaders of various countries want to scold: What about the cheat!

But now that the four meteorites are smashing towards the blue star, it is impossible for them to give up blocking and wait for the meteorite to fall and give the middle finger, so although they are tempted to do nothing, the leaders of various countries have held an emergency meeting to discuss how to deal with the current crisis.

"FOUR METEORITES ARE CURRENTLY FLYING TOWARDS THE BLUE STAR AT A SPEED OF 11.5 KM/S, AND IF THERE IS NO ACCIDENT, THEY WILL HIT THE BLUE STAR IN A FEW HOURS." A scientist from a United Nations action team was holding a report to the leaders of the participating countries, and in addition to reporting the time of the meteorite impact, he also gave the location of the meteorite impact: "According to orbital calculations, the location of the meteorite impact is likely to be North America and the Pacific Ocean." ”

Scientists did not say anything about the catastrophe caused by the impact, because everyone knew that if all four meteorites fell, then there would be no need to think about what would happen in the future, and humans would most likely be wiped out like the dinosaurs.

So the top priority is to find a way to stop these four meteorites and prevent them from hitting the blue star.

At least not to let them all fall.

"Now what else can we do to intercept those meteorites?" Faced with this crisis, the leader of the Yan Kingdom took the lead in asking, at this time, the only ones who can afford to consider intercepting are the leaders of the top five Blue Star.

"In fact, we don't have any good solutions, and in these few hours, we don't have enough time to launch a spacecraft and then go on an interception mission, we don't have time to refuel, and we don't have ready-made spacecraft." The British leader was in a very heavy mood at this time, and the expression on his face was also a look of despair.

As an island nation, Britain has neither the depth nor the resources to respond to such a world-class disaster.

However, at this time, the leader of Lucia had a different opinion, and he said very firmly and forcefully: "We still have the last resort!" Our Lucia spacecraft is still in space, and with them are more than two dozen nuclear bombs that we have launched! These nuclear bombs are enough to smash these meteorites! ”

Lucia's words made everyone's eyes light up, this is indeed their last resort, and it is the only good news at the moment.