Thousands of missiles rushed out of the human warship, scrambling towards Europa with a faint trail. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

The overwhelming number of missiles pounced on the delicious cake like a swarm of flying flies, and no one dared to doubt their effect, and at this moment, even the aliens felt desperate, and some of the alien warships actually escaped from Europa.

There was no longer any need for the expeditionary fleet to approach Europa, and Gao Kai immediately ordered the fleet to adjust its orbit, and the fleet turned a corner less than 30,000 kilometers away from Ganymede, gradually moving away from Ganymede.

At the same time, the alien fleets of Europa, Europa, Ganymede, and several other moons closer to Jupiter all took off and swooped down on the expeditionary fleet from all directions, but the closest was still the Callisto fleet.

"Commander, the observation team reports that the speed of the enemy army has suddenly increased, double the previous maximum speed!"

A smile appeared on Gao Kai's face: "Only now do you want to speed up?" It's late! ”

He guessed in his mind that the aliens probably wanted to replicate the tactics of the previous time, using Ganymede as bait to surround the Second Fleet near Ganymede, but they didn't expect that the main weapon of the Second Fleet was artillery, not missiles, which were easier to intercept.

The expeditionary fleet was speeding away, but the battle around Ganymede did not stop, first thousands of nuclear bombs smashed on the surface of Ganymede, the rising mushroom cloud had not yet dissipated, and a new mushroom cloud rose, and even two shells fell in the same position, and the mushroom cloud was set in the mushroom cloud.

The side of Europa facing the expeditionary fleet was almost covered by a nuclear explosion, the snow and ice melted and evaporated, the sand and gravel melted and vitrified, and everything in sight was completely wiped out in the nuclear explosion.

Seeing all this, everyone breathed a sigh of relief, but they didn't know why, but no one celebrated and cheered.

Although the expeditionary fleet destroyed Europa, the alien fleet is still there, and now the second fleet has exhausted all the ammunition reserves, only those dozens of fighters still have the strength to fight, and there is no ability to destroy the alien fleet at all.

Needless to say, everyone knows in their hearts that as long as the alien fleet exists for one day, it is the great enemy of human existence.

All the shells fell on Europa, and the missiles still needed a little time to arrive, and the battlefield fell into a brief stasis of froze.

Ye Han in the headquarters looked at Gao Kai curiously: "This is the end?" What about the back? ”

Although he ran to the headquarters early in the morning to watch the excitement, he knew his identity very well, and he never said a word during the battle, and he was not willing to speak until the end of the war.

"On the back?" Gao Kai smiled mysteriously, "You can see it when you look at it." ”

Ye Han cast his suspicious gaze on the screen, the shells ran out, only the missile continued to fly towards Europa, could the missile go around the back of Europa?

The missile swarm finally arrived at Europa, and the alien fleet, which was still holding on to its home planet, struggled to intercept it, and their efforts did achieve certain results, but they could not stop all the missiles.

In the past, the aliens could still rely on anti-aircraft fire on the ground to support them for a while, but now that the ground has been flattened by a large number of nuclear bombs, they can only watch the missiles fall into Europa.

It's like a meteor shower.

A rain of death.

Ye Han glanced at Gao Kai in surprise, the missile just fell into Europa, what is the difference between it and an artillery shell?

Gao Kai also gave Ye Han a confident look, and Ye Han's gaze turned back to the screen, just in time to see a mushroom cloud rising above Ganymede.

The air explosion, not the ground explosion of the shell, was the only difference that Ye Han found.

Gao Kai let out a sigh: "It's done!" ”

Many people, including Ye Han, were puzzled, what happened?

Only a few of the fleet top brass showed joyful smiles, which made everyone even more puzzled.

"We used a cobalt bomb ......"

Those who know how to do it suddenly realized, but the vast majority of people still don't know what to do, including Ye Han.

Seeing this, Gao Kai continued to explain: "The cobalt bomb is actually a type of neutron bomb, to put it simply, it is to add a layer of cobalt-59 shell to the outside of the neutron bomb. He made a wrapping motion with both hands, "The fast neutrons produced when the neutron bomb explodes bombards the cobalt layer, which can turn ordinary cobalt into the radioactive element Cobalt 60, and this thing can release high-energy gamma rays when it decays, do you understand?" ”

Now the vast majority of people understand.

Most people have never touched or even heard of cobalt-60, but it has a wide range of applications, such as breeding, flaw detection, disinfection, and radiotherapy.

Because of its wide application, there have been many casualties caused by cobalt-60 radioactive sources, such as picking up a shiny little thing on the road and bringing it home, and the whole family almost died. (By the way, it is said that most radioactive sources are made in the shape of chains or pendants, and if you encounter unidentified metals in the wild, especially small pieces of unidentified metals, don't bring them to your home.) ）

The principle of the cobalt bomb is also very simple, the air explosion of the nuclear bomb produces a large amount of cobalt-60, which continues to decay after entering the atmosphere, producing continuous gamma rays to irradiate Europa, even if the cobalt-60 dust lands, the irradiation will not stop.

What are gamma rays? It is a powerful ray produced in large quantities when a supernova explodes, and it is a high-risk ray that can kill all living things!

The spread of cobalt-60 is certainly not comparable to a supernova explosion, but the damage caused by gamma rays is not much worse, and even if the aliens do not die, they have to hide underground and honestly rat.

Although he understood the meaning of the cobalt bomb, Ye Han still couldn't let go, and asked worriedly: "Aliens flew in from outside the solar system, and the most important thing in interstellar space is radiation, they have a way to fly through interstellar space, can't they deal with cobalt-60 radiation?" ”

"It's okay, there's also the Sea of Clouds." Gao Kai said with a little loss.

Unhai ......

Everyone was shocked and turned their eyes to the screen.

Tens of thousands of kilometers away, the indomitable figure of the Sea of Clouds had already broken through the blockade of the alien fleet, and rushed towards Ganymede with countless fine lights.

The alien fleet desperately intercepted, and even did not hesitate to launch a fleet to crash into the Yunhai.

The uncontrolled Yunhai could not dodge or avoid, and was hit by three alien warships in a row, and the attitude of the battleship changed irreversibly.

But the deformed Sea of Clouds was still intact, and even if countless thin lights cut through countless fragments on its body, it still couldn't stop it from rushing towards Europa, only skewed the course of the Sea of Clouds.

The first half of the Yunhai fell into the atmosphere and continued to fall to the ground, and the other half flew away from the atmosphere, scattering countless unknown objects along the way, including artillery shells and missiles that were not launched in time, as well as various unknown objects such as the armor on the ship and the equipment inside, and even a reactor fell out.