Xia Lan felt like she had fallen into a soft mire, but the sticky mire was very strange. It was very comfortable, with just a soft damping and wrapping feel. What was even more surprising was that there was no trace of coldness or moisture in the mire.

On the contrary, it is very warm and dry.

This long-lost sense of comfort made her reluctant to let go, but there seemed to be a voice in the back of her mind reminding her of something, urging her to break free from the soft mire, but she could never hear the voice clearly.

After struggling like this for an unknown amount of time, I finally sat up from the bed.

She panicked and grabbed her phone from the bedside. She saw the line of numbers displayed on the screen.

"06:17"

Only then did she relax again, and she woke up three minutes before the alarm clock rang.

Apart from the officers on duty, there was almost no one on the street. In this city that had been cut off from power, it was so quiet that you could hear the sound of bicycle chains echoing in the streets.

On the horizon, a ray of morning light has already cast a thin halo on the rows of tall buildings on the horizon. I wonder if it is because there is no light pollution, but the halo surrounding the outer edges of the tall buildings now looks like...

Bloody red.

When she hurried to the National Astronomical Observatory Observation Center, the place was just like when she left yesterday. But in the crowd, she saw the figure of Minister Zhong.

Suddenly bright lights came on in the hall, and the whistling sound of electrical equipment starting up could be faintly heard from outside, like the low roar of a city giant waking up.

"The observation has been completed, and the data of the last two hours just sent back are still being analyzed. But the analysis of the data of the previous eight hours has been completed." An aerospace engineer said to Xia Lan.

"Did any valuable information be automatically filtered out?" Xia Lan asked.

"Around 11:35 and 3:14 in the morning yesterday, automatic computer analysis and screening showed abnormal signals."

The engineer's words made Xia Lan, Shen Manling and others around them startled. They looked at each other with complicated eyes. Because they knew that around these two points in time, there were 28 standard football fields in the mountains in the south.

As the earth rotates, the giant arc-shaped radio antenna sweeps over the orbits of Jupiter and Saturn.

"Play out the waveforms and simulated sound effects of the suspicious signal around 11:35," Xia Lan said.

Soon, a violently oscillating waveform line appeared on the large screen of the observation center, followed by noisy sounds from the speakers.

The sound was fragmented and harsh, like the sound of a glass cabinet filled with small balls of various materials being pushed to the ground and broken. However, the sound did not follow the small balls and glass scattered on the ground.

The dregs gradually subsided and decreased, but kept in the noisiest moment and cycled over and over again.

People at the observation center looked at the irregularly fluctuating waveforms on the screen, and scratched their ears with their hands, intentionally or unintentionally.

"Based on the information provided by IAU and NASA, filter out satellite communication clutter from other countries." Xia Lan said to the engineer in a loud voice.

Soon, among the fragmented and noisy sounds, there was a sound that sounded like a telegram in a TV series. But the overall sound was still very uncomfortable, and the changes in the waveforms were not obvious.

"Filter out the electromagnetic interference caused by the interaction between the solar wind and the Earth's magnetic field and Jupiter's magnetic field." This time Xia Lan just raised her voice so that the engineer could hear her instructions clearly.

The oscillation amplitude of the waveform line was suddenly reduced by half, and the sound in the speaker was also much softer. There was no more harsh sound of microphone current and fingernails scratching the glass. However, the high-frequency rhythmic drumming sound sandwiched in the analog sound was still there.

It sounds irritating.

"Filter out the interference from pulsars and cosmic rays." Now she can give instructions to the engineers in a normal communication voice.

The amplitude of the waveform has become very small and peaceful. The sound now is like the chirping of insects and birds heard in a cabin in the woods in the early morning. However, if you listen carefully, behind the laughter of the insects and birds, there are faint bursts of distant sounds.

There was a thunderous rumble in the sky. Many people at the observation center also noticed the unusual sound. Many of them even closed their eyes to listen carefully to the sound.

"Also remove the interference from the 3k cosmic microwave background radiation and the 21cm hydrogen line."

All the noise immediately disappeared without a trace, just like closing the windows of the forest cabin, leaving only a low rumble.

The engineer entered a few lines of commands on the keyboard, and as he pressed the Enter key, a voice that made everyone's hair stand on end echoed in the observation center!

After amplification and noise reduction, it was not the thunder in the distant sky at all. It sounded like an ancient steam engine locomotive. The steam pushed the heavy piston back and forth, making a dull roar. It was different from a real steam locomotive.

The same thing is that the low reciprocating roar is not regular and constant.

Sometimes it's as fast as the footsteps of children rushing to do exercises on the playground, and sometimes it's gentle like the sound of a sleeping man snoring.

The engineer suddenly slumped down on the chair behind the console. He held his head in his hands and dug his fingers deeply into his hair. His eyes were fixed on the wavy line on the screen that undulated regularly with the sound.

, shaking his head constantly. His eyes were full of fear and disbelief.

A female engineer on the console next to her was also staring at the waveform lines on the screen as if she was in a daze. Her trembling lips slightly opened, and her body seemed to be uncontrollably stepping back until she bumped into another person behind her.

A colleague who is also confused.

Xia Lan stared at the wavy lines that kept jumping, her eyes showing anxiety and panic but no fear. Suddenly, she felt someone gently touching her shoulder with a finger, and looked back. It turned out to be Zhong

The minister, at this moment, his usually calm face also showed a look of panic that he had never seen before:

"Dr. Xia Lan, is this sound coming from the satellites of Jupiter?"

Xia Lan's face was as calm as water, and she replied calmly:

"No, Minister Zhong. This is just a simulated sound effect based on the received radio waves."

"Then is there a certain probability that these radio waves were formed naturally... naturally under extremely coincidental circumstances?" Minister Zhong's voice was trembling, and there was a faint hope in the eyes that stared at Xia Lan.

Xia Lan took away the last straw without any surprise and shook her head gently:

"Electromagnetic waves of this magnitude and degree of modulation cannot be formed naturally. Our conjecture is correct - they are in the solar system, carrying out secret work on those two satellites."

Sighs of fear and despair mixed with the rumble that sounded like the end of judgment echoed in the ears of everyone in the observation center.

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