The telegram they sent to Earth was: Tomorrow at 7 o'clock to return home and discover the Martians.

As for why they made the telegram so simple, it was mainly because they were afraid of the all-pervasive radio invasion of the Martians.

After sending the telegram, they quickly closed the communication port to prevent the radio waves of the starmen from entering.

Huo An couldn't enter the spacecraft, and scolded and said: You don't want to leave Mars, we will destroy you, you wait and regret it!

Zheng Riqiang said: Then let's die together! We also have the means to destroy Mars!

Hoan asked: What do you have?

Zheng Riqiang said: No comment, you can try it.

Huo An was silent and flew away.

Zheng Riqiang said to Confucius Mei: There is a movie on the earth, called "500 Years Later", which tells the story of a totalitarian country 500 years later, where everyone lives in a white world underground.

In 1976, the film "I Can't Die" depicted that in 2274 AD, all young people over the age of 30 would be put to death in order to limit the number of people and the consumption of resources.

He said: In order to limit the number of people and the consumption of resources, they deprived the Martians of "food" and "color", what is the difference between living without food and color and being executed at the age of 30?

Now, they feel that these two features are important and want to get them back. How can things in the world be so cheap, they come and go when they are called!

The so-called high-tech, the so-called R&D and manufacturing, they rely on their powerful and exclusive power and financial resources to squander it. And ordinary people are just surviving.

What's even funnier is that a country is overridden and monopolized by a scientific research department, what kind of society is this? How could the state tolerate such a thing?

Theoretically, Mars rotates around 24 hours, 37 minutes, and 22.6 seconds. A day and night on Mars are slightly longer than a day and night on Earth.

But they felt like it was a long time.

They looked out of the ship's window, and even during the day, it was hazy because the sun was too far away.

They saw the earth as if it were nothing, like a star hanging in the sky.

The earth is so small.

It's definitely not like the moon watching the earth rise, and against a black background, the earth is like a blue gem, slowly rising.

It is said that when you look at the earth from the moon, you will feel great fear and shock inside.

Why is it scary to look at the Earth from the moon?

The mass of the Moon is about 735 billion tons, which is only 1/81 of the mass of the Earth, and the diameter is only 3/11 of the Earth.

And when astronauts on the moon look at the Earth, the apparent diameter of the Earth is particularly huge.

An astronaut who landed on the moon said: The earth is like a huge and fragile blue ball, hanging in the dark universe, as if you can reach out and touch it, the strange and shocking inner feeling is unimaginable, and people can't help but be in awe.

During this period, Huo An came once, lingered outside the aircraft, didn't say a word, sat for a while, and left.

Zheng Riqiang said: Want to turn us into Martians? They are all doing everything possible to restore function, how can we go down their old path?

Confucius said: Life without food and color is not what we need. Now that I have oxygen and water, I can grow vegetables. With oxygen, water, food, we can survive without having to be controlled by the Martians.

Zheng Riqiang said: Yes, yes, more than ten years ago, there was a science fiction movie called "The Martian", the protagonist Mark was trapped on Mars due to a sandstorm, and he decided to plant potatoes on Mars, and the potato planting was a great success, allowing him to get through one difficulty after another.

Actually, growing potatoes on Mars? It's not as simple as the movie makes it.

Because, the soil of Mars cannot be used to grow vegetables at all!

Scientists have found that the pH of the (simulated) Martian soil is too high, as high as 9.5, and very few plants on Earth (Populus euphratica can) can survive at such a pH.

Martian soil contains a lot of calcium perchlorate, a substance that is toxic to plants on Earth.

Therefore, it is simply impossible to grow potatoes with Martian soil.

In the same way, the soil of Mars cannot be grown with vegetables.

Because on Mars, most of it is organic sand, how to grow vegetables?

Scientists conducted an experiment in which they selected two plants: lettuce and arabic grass.

As a result, under the conditions of ensuring light, temperature, watering and fertilization, the plants failed to germinate seeds in simulated Martian soil.

Therefore, they can only carry out soilless cultivation, that is, they do not rely on the soil of the planet, use water and nutrient solutions, and have special light sources.

There is a precedent for this.

Back in December 2020, NASA harvested the first "space turnips" in history, 20 turnips, after astronauts had planted 15 species of plants, including eight leafy greens, on the ISS.

Scientists have discovered that growing radishes in space takes only 27 days to mature.

But what about Martian vegetables? Will it be successful?

Sometimes, after being busy, the two would sit side by side in front of the window of the aircraft, silently watching the scenery and looking at the giant Saturn that they were afraid of.

Of course, the desolate Mars is not without scenery.

That day, after finishing work, it was sunset, and Zheng Riqiang was admiring it.

Because Mars is far from the Sun, coupled with the fact that the atmosphere of Mars is suspended in a large number of small particles, this makes the sunlight on Mars quite weak, like the earth at dusk.

Hazy.

Seeing this, Zheng Riqiang smiled.

He remembers that when he was a takeaway boy, there was a time when he was delivering food, and at dusk, it was foggy again, and the visibility was very poor.

When he saw a person, he asked: Auntie, how do I get to Building 15?

Surprisingly, the other party is a man! He was very angry and said: Auntie, aunt. You see, I'm Uncle N!

Zheng Riqiang could see from the porthole of the vehicle that the scene on the surface of Mars was very desolate and arid, and there was no obvious difference from the desert and other areas of the earth.

Looking into the distance, you can also see that the sky of Mars is relatively hazy, which is still very different from the scene of the blue sky and white clouds on the earth.

Although Mars may look desolate, there is still water ice. At sunset on Mars, fine dust in the atmosphere absorbs blue light and scatters warm light, turning the sky away from the sun into a familiar ruddy hue.

At the same time, dust particles in the direction of the sun scatter blue light forward, creating a cool blue halo near the setting sun.

He shouted: Meimei, come and see, the sunset on Mars is actually blue, how beautiful!

There was no answer.

Zheng Riqiang said: I can't imagine that this wild place also has beautiful scenery.

Still no answer.

Zheng Riqiang had a premonition that something was wrong, and hurriedly walked over, and saw Confucius Mei lying on the ground of the vegetable greenhouse, unconscious, and couldn't help but be anxious: Meimei, Meimei, what's wrong with you?