I! Billions of invincible identities

There are countless craters on the moon. These craters are also of different heights.

Yang Fan did not walk forward vigorously on the road. Instead, while setting off, he was constantly surveying the terrain on the moon.

Look at the wobbly body, and the countless craters. Yang Fan stopped the car and walked down.

Craters are the impact of meteorites hitting the surface of the Moon. Yang San climbed a crater that was not very high. It looks like standing in a crater.

It's just that there is not such a high temperature on the moon, and there is no magma. Rocks everywhere you look.

"How big is the largest crater here?" Yang Fan stood at the top of the crater and asked Xiao Tian.

"The height is about two hundred meters. The width is wider. There's a huge meteorite in there. So far, it has become a cloud. "

For these things with some characteristics, Xiaotian remembers it clearly. Although he didn't know what Yang Fan asked these for, he still reported truthfully.

"The crater is wider, and the gentle slope in the middle is also larger. The total area is about the size of a half-made steel city

"Hmm." Yang Fan nodded and did not move. Standing there and thinking.

"Has the Moon been hit by meteorites since this time? Can you calculate the probability and timing of a meteorite impact on the Moon? Yang Fan is still more concerned about this.

"This cannot be calculated for the time being. But it can be done in advance. We were able to detect meteorites before they hit the moon. This can be five minutes in advance, which can make effective interception. "Small.

"That's not bad. However, if it does not endanger the safety of the Steel City, there is no need to intercept it. Yang Fan nodded. The largest crater can also be built. Hollow out the entire mountain or build another city. "

"That crater is compared to the current City of Steel, and I can let the robot build it." Xiao Tian said.

The group exchanged a few words and continued to drive forward. In the middle, Yang Fan would get out of the car from time to time to investigate. Sometimes I look at the thickness of the soil on the surface of the moon. Sometimes you climb craters to see what it looks like around them.

Finally, after two or three days of driving time, the little genius stopped the car.

The two of them, together with several robots, stood on the land of the moon and looked ahead. Yang Fan could clearly see that there were two robots ahead.

"Those two robots are what I left behind, and they are what we need to pay attention to. In a straight line formed by the two robots. As long as you go beyond that straight line, it's the undetectable 3% of the area. Xiao Tian looked at Yang Fan and looked at the two robots, so he explained.

"How big is that 3 percent? What does the shape look like? Are there any effective ways we can get in so far? "

Yang Fan involuntarily thought of the Bermuda Triangle above the earth. There are countless bizarre places at 30 north latitudes of the earth. And those places were also what Yang Fan was curious about, but he didn't have time to explore.

Now there are 3% on the moon. Yang Fan wanted to understand what was in this 3%? _

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