Chapter 197 Andrew? Please reply if you receive it.

The fantastic scene in front of him did not surprise Lv Yongchang too much.

Or rather, such a scene is actually very normal.

Water is not uncommon in the solar system.

It's just that due to the temperature, most of it exists in solid form.

The various signs in Gale Crater have shown that liquid water existed on Mars in the past.

According to previous scientific inferences, Mars had core activity 4 billion years ago.

Thanks to this, although it is not as good as the Earth, the environment of Mars has not become what it is now.

At least, it is possible that liquid water exists on its surface.

Lv Yongchang couldn't help but fall into deep thought.

What exactly caused Mars to become what it is now?

"Professor, according to the latest news sent back by Captain Bai Yixuan, a huge flood occurred in Gale Crater about 3.9 billion years ago."

Zero's voice sounded again.

Scenes appeared in the holographic image.

"This is..." Lv Yongchang looked at the giant wave-like pattern in the picture and frowned tightly.

"Reverse dunes, each one is about 9m high, and the distance between each reverse dune is about 140m." Zero quickly marked the detailed data of these wave-like patterns on the holographic projection, "According to calculations, this is the trace left by the great flood."

Reverse dunes

"And after this great flood, the liquid water on Mars quickly disappeared and became what it is now."

Looking at the simulated images in front of him, Lv Yongchang nodded thoughtfully.

"The great flood 3.9 billion years ago..." He muttered to himself, "Zero, I remember that the largest crater on Mars, the Hellas Basin, should also have been formed 3.9 billion years ago, right?"

"Yes, professor."

Faced with such coincidental data, he suddenly had some unreliable guesses in his mind.

"Zero, simulate a Mars whose core has not cooled down yet."

As soon as the voice fell, a red planet with a relatively dense atmosphere and a slightly blue surface appeared in front of him.

Lv Yongchang nodded with satisfaction.

For Zero, who has mastered a lot of data, this level of simulation is relatively easy and accurate.

If no unknown accidents happened, this should be Mars 4 billion years ago.

At this time, Mars was just born 500 million years ago.

Conservatively estimated, there should be no life on Mars at this time.

The reason is simple, the time is too short.

Even the Earth, which was born 4.6 billion years ago, did not show signs of life until 4 billion to 3.8 billion years ago.

"Continue, simulate the impact of the meteorite that formed the Hellenic Basin."

As the voice fell, a huge meteorite, with extremely powerful kinetic energy, slammed into the location of the Hellenic Basin on Mars.

The world turned upside down!

In just a moment, in Zero's simulation picture, Mars showed extremely obvious changes.

A large amount of magma overflowed from the core, and even some of the magma escaped from the gravity of Mars and was thrown into space!

Time passed quickly.

The large amount of magma thrown out gathered and solidified in space to form two satellites.

Phobos and Deimos.

As for Mars, after losing so much magma, the cooling process of the core accelerated rapidly.

But as the core cooled and the magnetic field disappeared, another major event occurred.

The heat from the meteorite impact completely melted the polar ice caps of Mars!

Then, greenhouse gases and water vapor worked together to briefly turn Mars into a warm and humid planet!

Under the global rainstorm, the blue and red planet appeared in front of Lv Yongchang again!

The good times didn't last long.

This suitable living environment quickly dissipated as the core cooled and the magnetic field disappeared.

The powerful solar wind blew away the atmosphere of Mars, and the original ocean gradually dried up.

Gradually, Mars became what it is now.

"Huh..."

Lv Yongchang exhaled deeply.

The scenes in front of him just now were like an epic disaster movie, which deeply shocked his heart.

After a moment of silence, he asked again: "Zero, how long did Mars last in the final stage?"

"Professor, according to the simulation, the ocean formed by the flood should have lasted for about 200-300 million years." Zero said quickly, "There is insufficient information about the liquid water in other small areas, and it is impossible to judge."

"Enough." Lu Yongchang's eyes were stern, and he whispered: "This time is enough to evolve some basic life forms!"

"Zero, tell Bai Yixuan to be careful when bringing back samples, there is a high possibility of residual microorganisms in them!"

...

Mars, Gale Crater.

The several-day drilling sampling and mapping mission exhausted the energy of the six astronauts.

The two Xuannv IIs were quietly parked on the vast red land.

In the cabin of the first Xuannv II.

Hong Fan, wearing a protective suit, carefully took three space suits covered with wet Martian dust to the cleaning room.

In order to prevent microbial contamination, these space suits need to be fully disinfected and cleaned before they can be used again.

The improved space suits were not heavy. Even if there were three of them together, Hong Fan could still walk with three space suits in his arms easily, thanks to the smaller gravity on Mars.

Thinking of the task that was updated not long ago, the corners of Hong Fan's mouth rose a little.

They need to send the drilling samples back to Mars City.

This means that they can have a good rest in Mars City for a night.

This is undoubtedly a great temptation for them.

Recalling the soft bed in Mars City, Hong Fan's footsteps suddenly became lighter.

The amplitude of the up and down flipping of the space suit in his hand also increased.

Suddenly.

A small drop of crimson wet Mars sand fell on the deck of Xuannv II.

The next moment, Hong Fan's electromagnetic boots stepped on it.

After a slight friction, this small drop of wet Mars sand was evenly spread on his electromagnetic boots and the deck of Xuannv II.

The trace became blurred.

...

"Brother Fan?"

"Has the space suit started to be cleaned and disinfected?"

When Hong Fan returned to the cockpit, Xia Wanyi's voice came.

"Of course." Hong Fan sat on the chair and stretched out his hand to fasten the seat belt.

"Captain, can we go back now?"

Sitting in the main seat, Bai Yixuan turned his head and glanced at Hong Fan, shrugged and said, "When Andrew and the others are ready, we can set off."

As he spoke, Bai Yixuan pressed the team's radio switch.

"Andrew, are you ready?"

"..."

No response.

After waiting for a few seconds, Bai Yixuan raised his eyebrows slightly and pressed the communication button again: "Andrew? Got it, please reply!"

Still no response.