[Huogu, this thing you built is the one that seems to be very powerful...... Belch...... What's it called? 】

[Oh, yes, it's called 'E=MC^2'. 】

Twilight was looking at the metal bodies that were gradually speeding up in the circum-equatorial magnetic tracks, from its divine perspective.

A kilogram of metal would circle the planet's equator for two weeks, and then be launched from the remaining orbital megastructure, at which point the initial velocity of a small projectile with a mass of one kilogram was already more than 90 percent of the speed of light.

What Hogu has built this time is already a completely large sub-light weapon, this kind of thing, even if it is science fiction movies or novels, is not something that will be mentioned very often.

Hogu relies on radio pulses to lock onto targets in space, while aliens do not rely on radio pulses for positioning, but the essence is the same, both use light-speed particles to hit the target and feedback to receive it, so as to obtain the position information of the target.

However, in the face of sub-light shells, the limitations of this positioning method become very large, because the movement of the shells is close to the speed of light, and the shells will chase closely behind the reflected radar beams, and when the radar receives the beam carrying the position information of the shells, in fact, the shells are very close to the position of the ship, and it is too late to make effective avoidance measures, so they can only resist hard.

This is also why the radar of the alien fleet failed to detect the 'faint blue thing' before, on the one hand, it is indeed because of its small size, but more importantly, on the other hand, it is its own sub-light speed.

"E=MC^2 is a formula, not the name of an object......"

Huo Gu complained speechlessly, and then explained.

"This formula expresses what form of existence a mass object will become when its speed is increased to the speed of light, and the relationship between mass and energy at that time."

The misunderstanding did not embarrass Twilight, and the mind was not as complex and diverse as that of humans, and it accepted its cognitive errors very calmly.

Twilight thought about it, organized the confusion in his heart into a question, and asked Huogu.

[I remember you said before that the formula for the motion of an object is Ek=1/2MV^2, why does the formula become E=MC^2 after an object with mass accelerates to the speed of light?] 】

"If I understand this, will I still call them perpetual and learn physics? But you, aren't you better than me in that aspect? How do you ask me this? ”

Hearing Twilight's inquiry, Huo Gu felt that his head was big for a while, how could he know this kind of thing, these physics formulas he was using now were just the accumulation of knowledge memorized by rote in high school.

At the beginning, it was all about coping with the college entrance examination, and I was not in the mood to delve into why this happened.

Twilight mistakenly thought that Huo Gu didn't understand the question he asked, so he emphasized one side of the point.

[The principle of the thing you built is quite simple, it is nothing more than using an electric field to push the metal body, as the length increases, the metal body will be accelerated faster, I just don't understand how the two formulas you said before are converted, where does the half of the kinetic energy formula go?] Why is there no E=MC^2? 】

"Don't ask me, I haven't studied this specifically, since you're so curious, you might as well study it yourself, let Perpetual teach you mathematics, and then derive the formula yourself."

[But Hogu, aren't you able to use formulas freely? Why don't you understand? 】

"Who told you you you can't use it if you don't understand? Haven't you heard of 'rigid copying'? ”

“…… No, you really haven't heard of it. ”

As Hogu muttered to himself, Twilight was distracted by something else.

I saw it asking Huogu in the channel,

[Hogu, have you noticed? 】

Huo Gu was pulled back from his thoughts, and Huo Gu was a little confused by this endless sentence, and he roughly examined all his senses, and found nothing unusual.

Filled with doubts, Huo Gu asked Twilight.

"Notice what?"

[In the direction of the enemy, there are many objects approaching at high speed, but it is still some time before they come to our position.] 】

"What?!"

Twilight's answer made Huo Gu vigilant, not as relaxed as Twilight, but Huo Gu understood the seriousness of the problem, and the enemy was an opponent who needed the earthlings to rely on the whimsical 'myth' to describe and understand.

Huo Gu had thought more than once that if these aliens were not his opponent, but the Earth Civilization, what would be the chance of the Earth Civilization winning?

The Sky Eye system began to search, searching for the objects that Twilight had said, and Hogu needed more accurate information to deduce the true face of those high-speed objects, and then achieve targeted defense.

But as it turned out, nothing was found, nothing was found between the alien fleet and Hogu, and there was no echo signal from radio pulses.

"Where? Why didn't I see anything? ”

Even though it was a full-powered Sky Eye system, Hogu still couldn't spot the objects approaching at high speed, and it thought that Twilight was joking with it.

However, Twilight was in a firm tone, without the slightest hint of joking.

[Maybe it's too small, but after a while, you can see it.] 】

In this way, Hogu kept his faith suspicious for more than a dozen days and nights......

At this time, the Sky Eye finally observed a large group of objects approaching at high speed, which appeared to be geometrically long fusiform shapes, and looked like some kind of cannonball with special abilities in online games.

With caution in mind, Hogu decided to destroy the objects, and based on this idea, live ammunition was fired as interceptors.

However, a scene that Hogu never expected happened.

"Dodge?!"

During Hogu's observations, the individuals who used to intercept the shells were dodged one by one, and it was because of this that Hoguna's suspicion that these objects were cannonballs was overturned.

Could it be a missile?

Hogu thought of the last time he was in a battle where a meteorite no less than the size of Mount Everest could be turned into powder.

Hogu, who had learned the hard way, decided to use a large number of bullets to encircle and intercept.

"I'll see how you hide this time."

In the face of the overwhelming metal barrage, Huo Gu was confident that those things would definitely not be able to dodge no matter how they could dodge, as Huo Gu expected, they really couldn't dodge.

However, this does not mean that the bullet will have the desired interception effect.

Through the observation of the Eye of the Sky, Huo Gu only felt that the figures of those unknown objects had become blurred, and just when it was puzzled, the truth of the situation was revealed in a word.

[Hogu, the things you released seem to be useless, and they are all shattered in the outer layer when they come into contact with those high-speed objects. 】

"Smash? To what extent? ”

[Hmm...... It is probably similar to the vaporization reaction after high temperature. 】