Magnetic railgun, which uses electromagnetic force to push cannonballs, is a kinetic energy weapon with great lethality, which belongs to a new concept of science fiction weapons before Huo Gu crosses, and only appears in those science fiction film and television works and novels.

Unlike traditional cannons, which use violent chemical reactions to provide propulsion, the railgun itself does not need to take into account the powerful shock waves generated by chemical explosions and the smoke after the reaction.

Whenever a traditional gun is to increase the power of a gun, it is necessary to lengthen the barrel to stabilize the trajectory, and the shell charge needs to be larger to provide more powerful projectile propulsion.

All in all, the volume needs to be bigger and bigger.

It's fine if it's just that, but when you put it together with another law of physics, the problem becomes very serious.

The strength of the object will become fragile with the amplification of the body, the fundamental reason is that due to the increase of internal stress, the strength provided by the atomic bond can only be barely resisted, once the external force amplifies the stress beyond the force that the atomic bond itself can provide, then the object will also be declared to disintegrate.

Therefore, the barrel of the artillery needs to be thickened, because it is necessary to combat the shock wave from the explosion of the shell charge.

But railguns don't need to think about this kind of problem, so when Hogu was still on Earth, this type of cannon was generally favored by various countries.

The only problem that shackles countries from popularizing this kind of cannon to the army is energy, the consumption of electrical energy is too great, and the essence of the railgun is to convert electrical energy into kinetic energy to propel artillery shells.

In the chaos of the battlefield full of artillery fire, a cannon still connected to the large rear nuclear power plant is undoubtedly a bad idea, and the mobility alone is enough to make the military generals turn away.

But Hogu doesn't need to think about this.

Energy supply? Chemical energy is used to generate electricity from every corner of the earth's surface, including the seabed, with an entire planet's surface power stations powering railguns, and low-temperature superconductors made from dry ice being built inside the rhizomes, completing the lossless and global coverage of electrified wires.

It is precisely in order to build these that Huo Gu perfunctorily completed the design of the projection of the Sky Eye to space, and directly applied the design layout of the Earth rocket.

When the planet's rotation shifted the direction of the railgun's muzzle to aim at the alien fleet, Hogu's order was given.

"Launch!"

After the command was given, the fist-sized metal body began to increase its speed under the action of an electric field.

Due to the need to fight against the gravitational force of the planet itself, the speed of the metal body can only increase by one meter per second, and the air resistance is negligible, in order to avoid friction and heat, resulting in spontaneous combustion of the entire giant structure, Huo Gu will pump out all the air inside, in a vacuum state, the muzzle of the cannon has penetrated deep into the fugitive layer, and there is no need to worry too much about the entry of air from top to bottom.

The length of the railgun has reached a length of 1,000 km, and this monstrous material science has never been mastered even by humans on Earth.

This is the accumulation of Huo Gu for so long since he crossed over, and it is also the reason why Huo Gu didn't ask them to learn chemistry in the first place.

The essence of chemistry is the structure of atomic bonds connected to each other, and the entire macroscopic world is built by losing electrons and gaining electrons, and more essentially, it is the 'electromagnetic force', one of the four forces on the microscopic scale.

With this understanding, Huo Gu has been constantly trying various types of atomic combinations since the period of the Plutozoic period, as long as it is the atom that can be obtained on the planet, it has basically been combined once.

Hogu's understanding of chemistry is as difficult as a child's understanding of building blocks, let alone such a long period of accumulation.

According to the conversion, the length of the railgun barrel is approximately equal to the velocity of the shell itself, which means that the initial velocity of a fist-sized shell when it leaves the muzzle is 1000 km/s.

What kind of concept is this?

This is one-third of the speed of light, and the accelerated projectile itself has a mass of 10kg, and the kinetic energy has reached 5x10^11 joules, limiting the energy released by a nuclear bomb to the size of a fist, and basically no atomic bond can resist this level of kinetic energy.

The point is that there is more than one projectile that has been launched into the universe, due to the particularity of the railgun itself, there is no need to consider the airtightness of the explosion chamber at all, and the way of dropping the shells is extremely similar to the 'metal storm' that once shook the earth, and it doesn't matter if the interval between the shells moving in orbit is reduced to one decimeter, because of the vacuum environment in the barrel, so there is no need to consider the cavitation effect.

There was not just one such building, and the scene was a terrifying barrage of 300 per 1 light speed, with 500 billion fist-sized projectiles projected.

However, although these projectiles are hugely powerful, it still takes seventy or eighty hours to hit the target, which gives the alien fleet time to react.

The bridge echoed with the announcer's hurried report.

"Commander! Radar echo scans a large number of objects approaching at high speed! Speed 1000km/s! Launch direction, target star! ”

"Tell the whole ship to change course, spread out in formation, and widen the distance."

The fleet commander calmly gave the order, his eyes locked on to the projector, which showed a circle of blood-red warning signs approaching his own fleet at high speed.

The time was the fifth hour after Hogu fired those metal bullets, and since the two sides were approaching at high speed, the relative speed was higher, and the meeting time was shorter.

Even on the bridge, the aliens could clearly feel a microtremor, and it was clear that the ship had been shot.

"Thirty damaged vibration armor!"

"It's airtight!"

"The engine crew is normal!"

"The life-sustaining system is normal!"

"Four batteries damaged!"

……

The reports came and went, and the commander's tense expression showed a little slackness, and then asked.

"What about the ships?"

"Six ships have been confirmed to be damaged due to too many bullets, three ships are being repaired due to the hit vector vents, which may affect the slowdown of the ships behind, and the other ships have survived because of your previous order to turn on the vibrating armor, but the more vibrating armor is damaged."

The commander nodded slightly, and ordered again.

"Command the maintenance team as soon as possible to repair the vibrating armor, this kind of attack will never be only once, and the ships will not change their current scattered formation."

"Yes!"

If Hogu had known the outcome of the attack, he would have jumped to his feet in anger, if it had legs.

Although it cannot be said that there were high hopes for this wave of attacks, thinking that they would be able to win and lose in one go, the results of this battle were far lower than Hogu's initial expectations.

The existence of the vibrating armor made Hogu's raid end without a hitch, and it took a lot of energy, material resources and energy in exchange for only six ships out of 10,000 warships.