"Sir, Xiaotian has successfully received resources from Earth, do you want to build all of them into Star Destroyer Cannons?"

Zhao Yu pondered for a moment and said, "Can the Star Destroyer Cannon be loaded on a U-shaped spaceship?" ”

"Yes, but with it, it will be difficult to install other weapons, and besides, I don't recommend that you put the Star Destroyer on the battleship......"

"How?"

"The Star Destroyer is very powerful and fast, but it also has two drawbacks......"

"One, it takes a long time to start and it takes a long time to brew ......"

"Second, it can only hit fixed targets, and if you encounter other spaceships, it will be difficult to lock on to ......"

Zhao Yu nodded slightly and asked, "What weapons can be installed on the U-shaped spaceship?!" ”

"Laser cannons, plasma cannons, kinetic energy cannons, ......"

"The laser cannon, its attack speed is very fast, reaching the speed of light, but because of the principle of diffraction, the power will decrease with distance, unless the power generation is increased, the current technology, the longest range is only 10 million kilometers, in the cosmic environment, the effect is limited......"

The closest places to the Moon and Mars are more than 50 million kilometers, and it is impossible to hit long-distance targets with laser cannons.

"In addition, the laser cannon is limited by the caliber, and the attack range is not large, even if it really targets the space battleship, excluding other factors, one shot will make a small hole in the battleship at most......"

However, the laser cannon is very useful as a defensive facility, and the original disadvantage has become an advantage.

For example, it can fly at the speed of light, and the closer it is, the more powerful it is, and so on.

Zhao Yu's moon base has more than half of the defense system, which is mainly based on laser cannons.

Uncle Da paused for a moment, and then said: "The plasma cannon uses a laser to heat heavy hydrogen to a high temperature of one million degrees Celsius, so that it becomes an ionic state, and then uses electromagnetic technology to launch it, and its range is not as good as that of a laser cannon......"

"Kinetic cannons, compared to the first two, have an advantage in attack......"

"Compared with laser cannons, the use of kinetic cannons can be said to have an infinite range in the cosmic environment......"

"It's just that the kinetic energy cannon is not very powerful, which is both its disadvantage and its advantage."

"Our existing kinetic cannons mainly include railguns and coil cannons......"

"The shells fired by the railgun are in frictional contact with the track, and the power will also decrease with distance, but the advantage is that the rate of fire is high, the mass of the shell is very light, the initial velocity will be very fast, and it is very advantageous to fight with warships in the universe......"

"The coil cannon is slightly more powerful than the railgun, and can also be used as a common weapon for warships......"

Uncle Da explained while projecting a three-dimensional image, presenting the advantages and disadvantages of various weapons.

Among the four weapons, the most powerful is the laser cannon, fired at close range, almost not giving the enemy a chance to dodge, but the rate of fire is limited, there is an interval between each cannon, and it takes up a lot of space, the same area, a laser cannon, can be placed ten railguns.

Plasma cannons, compared with laser cannons, have more advantages in the face of electronic products.

The other two kinetic energy cannons are more flexible, and any railgun can achieve 100 rounds per second.

The disadvantages are also obvious, the power is limited, the shells are small and light, and the main thing is to destroy enemy warships.

Uncle Da thought for a while, and then said, "In addition, regarding the situation of fighting other warships in the universe, I have simulated it with the existing data......"

"What the actual combat situation is, I don't know for the time being!"

Lacking actual combat experience, he doesn't know which aspect of data is the most important in space warfare.

Of course, the main reason is also that there is no physical warship on hand, and it is not known what the configuration on it will be.

Camouflage, stealth, detection, locking, etc., any crotch pull may be destroyed by the enemy.

Zhao Yu glanced at the time on the system to warn the arrival of the alien fleet for the first time, there were still two months and ten days.

Now, he also figured out that the alien fleet definitely did not refer to the earth, because when the title system appeared, it was clearly said that the earth was his native planet.

So, before that, he needs to be ready to deal with the alien fleet.

In terms of lunar bases, the defense capability has been achieved to the extreme.

Zhao Yu believes that a civilization of the same level, as long as it is not a planet that comes over as a backup, otherwise simply with the firepower of the fleet, no matter whether they are a hundred ships or a thousand, they will not want to break through.

The only thing to do now is to increase the means of active attack, such as various types of space warships.

"Then build two more Star Destroyer cannons, and the others are mainly ship-based laser cannons, ship-based plasma cannons, and ship-based kinetic energy cannons......"

……

Association for the Exploration of Extraterrestrial Civilizations.

This association did not participate in this feast of swearing.

After all, they are astronomy enthusiasts, preferring to look at the universe rather than swearing.

On this day, a member of the association discovered an asteroid in the dark universe.

He immediately followed up.

"Estimated diameter of 50 km ......"

"Start Trajectory Measurement ......"

"The calculation failed, the speed is too fast......"

After thinking about it, this member uploaded the data to the Great Xia Space Agency.

"I hope this asteroid isn't captured by the eight planets, so that it can be named after me......"

……

Great Xia Space Agency.

In the past three days, they have also been very busy, helping Chief Engineer Yang to think of swearing, communicating with colleagues in other departments, and synchronizing data to the Earth Joint Defense Agency, etc.

Sun Mingyuan was doing routine work when he suddenly received an email from the Extraterrestrial Civilization Exploration Association, a non-governmental organization.

Their space agency generally has some connection with these folk astronomy enthusiasts.

At least half of the unknown signals in the universe come from folk enthusiasts.

Therefore, after seeing the email, Sun Mingyuan was not surprised, and clicked on it casually.

"Huh? Asteroid? ”

"50 km diameter ......"

After thinking about it, he began to use the high-end equipment of the space agency and began to calculate the trajectory.

Trajectory ......

"0.01% chance to hit the Earth......"

"This!"

The 1 in 10,000 chance is not small, and Sun Mingyuan hurriedly reported the situation of this asteroid.