Three days later.

Zhao Yu stood at the observation point of the base, picked up a pair of telescopes through the glass and looked into space.

In the footage, four spacecraft line up in a square line and head towards the moon's orbit.

"It's finally here......"

Zhao Yu thought that he could get the technology points after the deal was negotiated, who knows, he didn't wait until he arrived, and he realized that the transaction would be completed only after the other party's resources arrived.

For him, the original intention of trading watches was to obtain the return of technology points from the title of 'Mystery Merchant', which was a one-time deal.

Trading watches with the earth is only a one-time transaction, but if you invest in the earth and build a factory, then you will continue to get resources.

Under Zhao Yu's gaze, the four spacecraft slowly landed on the surface of the moon, and the landing position was exactly where the White Rabbit 9 left.

It was the agreed trading place between the two parties, and a large number of Howling Sky was already on standby, and the moment the spacecraft landed, the shield was turned on.

……

Joint Defense Agency for the Earth.

For the first time in a deal with aliens, all the staff of the newly formed Defense Agency are on standby, keeping an eye on the situation of the four spacecraft.

On the spacecraft, not only the resources required for this transaction, but also various detection equipment.

For the shield of the shimmering sky, countries have long recruited experts and held countless meetings.

Many conjectures and methods have been proposed, and this time it can be used as an experiment.

Looking at the measures they propose, can they bypass the shield and continue to work?!

"All data is good, the spacecraft is landing......"

"The landing is successful, and the probes are all turned on!"

"Turned on ......"

"Next, it's up to us to see if we can do it!"

Not far in front of Colonel Chu, there was a row of sixteen screens, connected to the equipment on the four spaceships, ready to use various methods to try to bypass the shield.

Wow!

As soon as the words fell, the sixteen devices in front of him went dark in an instant.

"It's all black?!"

Senior Colonel Chu frowned, looking at it this way, these sixteen kinds of experiments all failed.

Extraterrestrial shielding technology is even more powerful than they imagined, and it needs more in-depth research.

He was not the only one who was frustrated, but also the experts and scholars who set up these experiments.

"Is it possible that the equipment is malfunctioning?!"

"Impossible, don't think about it, this is the trading point with aliens on the moon, there is no other possibility except for the shield......"

After a minute, sixteen screens were back to normal.

Inside the ship, all resources disappeared, and in their place were 10,000 watches placed in each of the four ships.

"The thing is gone, only the watch is left......"

"The deal is done, let's control the spaceship back......"

……

[Transaction complete, gain 850 technology points!] 】

On the moon, after Xiaotian moved the resources, Zhao Yu received the technology points rewarded by the system.

Coupled with the remaining ones that have not been used in the past few days, Zhao Yu now has a total of 1150 technology points.

"You can get a spaceship!"

Zhao Yu got the technology points and went straight to the control room, intending to get out the spaceship with a dual-core power system worth 500 technology points.

Found a nuclear-powered, magnetic dual-core spacecraft, Zhao Yu clicked on the exchange, but who knew that he got a hint.

[This exchange requires the exchange of 'Saucer Spaceship' and 'U-Shaped Nuclear-Powered Spaceship' first.] 】

"There are preconditions, and it ......"

Zhao Yu had also encountered exchange items that required preconditions before, and it was not surprising.

He now has 1150 tech points, the saucer ship is worth 400 tech points, and the U-shaped ship is worth 450 tech points.

He could buy all the money in his hand, but he wanted to take out 500 technology points and exchange the gravitational lens first.

Gravitational lensing is the upper limit of the detection means that can be exchanged for a Level 1 base, and it can detect all things through gravitational waves, whether it is a natural celestial body or an artificial celestial body, as long as it has mass, it can be discovered by gravitational lensing.

After thinking about it, Zhao Yu pulled up to the list of gravitational lenses and clicked on the exchange.

[Gravitational Lens purchased successfully, consumes 450 technology points.] 】

Zhao Yu picked a place, set up the production line, and then turned his head to look at the spaceship.

With 700 tech points remaining, only one of the two ships can be made.

Zhao Yu thought about it, copied the detailed data of the two spaceships, left the control room, and found the housekeeper.

"If you only move between the Earth and the Moon, the saucer will be faster......"

"If you want to add weapons, the U-boat can be equipped with more without destroying the power system......"

Zhao Yu was stunned for a moment and said, "The addition of weapons to the saucer-shaped spacecraft will affect the speed?!" ”

"Yes, the size of the saucer-shaped spaceship is much smaller than that of the U-shaped spaceship, and in order to increase the magnetic power, the entire spacecraft frame uses a special structure, and the addition of weapons will inevitably destroy this structure, which will eventually lead to a decrease in speed......"

"The power of the U-shaped spacecraft relies on the nuclear fusion reactor to propulse, although the power system alone occupies one-third of the spacecraft, but the remaining two-thirds can be equipped with weapons at will, without affecting the power ......."

"What about speed?"

"The maximum speed of the saucer-shaped spacecraft in the interior of the planet is Mach 100, and it decays after leaving the planet, and the fastest round-trip speed between the Earth and the Moon takes only 4 and a half hours......

"The U-shaped spacecraft has two power modes, the speed of conventional nuclear power in the universe is about Mach 50, and in the interior of the planet, it will be slightly reduced due to the influence of air friction......"

"In addition to conventional power, the U-boat is also equipped with a nuclear pulse propulsion method, which is capable of providing a one-time maximum flight ...... of 200 times the speed of 200 times the speed of no more than 10 minutes"

"What happens if it's more than 10 seconds?" Zhao Yu asked with some curiosity.

"It's going to blow up!"

The advantages and disadvantages of the two spaceships were revealed, and Zhao Yu also began to think about it.

The purpose of building a spaceship now is to build a factory on the earth and sneak around the earth by the way.

From this point of view, it is obvious that a saucer-shaped spacecraft is more suitable, using magnetic power, whether it is starting or flying, it is noiseless.

On the other hand, the U-shaped spaceship is obviously more suitable to be converted into a warship full of weapon systems.

"Then this saucer-shaped ship has no way to hold weapons at all?"

"Yes!"

"You can build a sonic weapon production line and assemble it on a saucer......"

"How's it might?!"

"The power caused to the building is very small, almost none, and at most the glass shatters......"

"But it's lethal enough to creatures, and the specific data won't be known until it's built and tested......"

After chatting with the housekeeper for a while, Zhao Yu gradually had an idea.

Under the condition that there is no problem with safety, first build a production line for a saucer-shaped spaceship, and then build a sonic weapon system to install it on the spacecraft.

As for the U-shaped nuclear-powered spacecraft, wait for another ten days of technology points, and then get them.

Redemption completed.

After deducting 400 technology points for the production line of the dish-shaped ship, another 50 technology points were deducted for the sonic system.

In the end, Zhao Yu had 200 technology points left, and at the growth rate of 24 technology points per day, another 10 days and 10 hours would be enough to exchange for the production line of the U-shaped nuclear-powered spacecraft.

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