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Most videos of extraterrestrial space exploration that people watch are basically silent, and if there is sound, it's added BGM in post-production.

This is related to the fact that the governing body does not release the original sound, and also because there is really no sound to hear in space.

Sound is a wave that propagates through a medium, but some waves are large and some are small.

The greater the density of the medium and the closer the distance between molecules, the stronger the ability to transmit sound, because the essence of sound is the transmission by the mutual collision of molecules in the medium.

Space is not an absolute vacuum, but its medium density is very small, and the distance between molecules is super large. You may not encounter one for a long time, so the ability to transmit sound is very, very, very weak.

Space exploration equipment naturally has sound during operation. Collisions of various pipelines and components will produce sound. Let alone whether the average person is interested in this sound, general sound receiving devices may not be installed on space exploration equipment.

Because every rocket launch payload is 'calculated to the ounce', it is too expensive. It is a waste of payload to install that kind of 'useless' equipment. Wouldn't it be better to install other scientific research equipment?

Such as electromagnetic signal detection equipment.

This thing can receive electromagnetic waves on the planet, and scientists can convert these electromagnetic waves into sounds that the human ear can hear, and then people can listen to the sounds from space.

Don't mention it, the sounds of the various planets in the solar system sound... quite unique.

The sun's 'humming'.

Mercury's 'whistling'.

Venus's 'chimes'.

Earth's 'wind'.

Mars's...

Terror, horror, wailing, grandeur, praise, death knell, etc., all kinds of sound effects can even make people feel natural fear, make their hair stand on end, and finally deepen their space phobia.

Fortunately, those sounds are inaudible to human ears and require conversion by various devices, so humans will not suffer that kind of crime every day.

Of course, this thing is 'artificially translated'. Using different methods to 'translate' will result in completely different sounds, so just listen for fun.

When it comes to planets with atmospheres, the detection direction is different.

Because they have air above them, people can hear sounds in the same way as on Earth.

As Earth's two neighbors, Venus and Mars, humans have studied them 'most thoroughly', including the sounds in their atmospheres.

On Venus, all sounds become low and deep.

If a soprano on Earth went to Venus, she would become lower than a male bass. Therefore, beautiful songs on Earth would probably no longer be beautiful on Venus, like a record player running out of power.

If a tiger on Earth went to Venus, then the tiger's roar would be thicker and deeper, but it would make people feel like a strange little animal making a heavy sound. It is not only low and deep, but also weak.

It's probably a tiger that doesn't show its power, or a kitty cat that looks like a tiger, with a pink bow.

But no matter how low the sound is, it can travel very fast and very far on Venus.

Why is this happening?

As mentioned earlier, the propagation of sound is related to the type, density, and temperature of the gas.

In gases with larger molecules, higher density, and lower temperature, the speed of sound propagation is faster, but the vibration frequency of the sound will also be lower, that is, the pitch will be lower.

It is easy to understand that denser substances transmit sound faster, just like solids such as steel on Earth transmit sound faster than liquids such as water, and water transmits sound faster than air.

People cannot be generalized, and planets of course cannot be generalized.

Venus's atmosphere is so dense that it is almost like a liquid, with a density 100 times that of Earth's atmosphere and a much greater pressure than on Earth.

It takes more energy to excite the fluctuations of the dense atmosphere in such an environment.

So if it is the same sound vibration, when it reaches Venus, the amplitude of the Venus gas vibration it excites is smaller, so the pitch becomes thicker and the sound becomes weaker.

The sound on Mars will be the opposite of that on Venus. The sound will become sharper on Mars, but the speed of sound propagation will be much slower, and the propagation distance will be much shorter.

That's because the sound propagation on its surface is equivalent to the atmospheric conditions 30,000 meters above the Earth, and the air is extremely thin.

More than ten years ago, the American Aerospace Agency launched the Phoenix Mars Lander, the purpose of which was to detect whether there was life under the soil or ice caps of the Martian polar regions.

During that Mars landing, scientists added a microphone by the way.

The Phoenix's landing was relatively lucky, and the whole process was captured by the European Mars Express orbiter.

Through the microphone on the Phoenix, scientists could hear the sound of the Phoenix landing.

When it descended with the parachute, it heard the sound of fine raindrops, and then the sound of raindrops mixed with a whistle, and the whistle became sharper and sharper.

When the Phoenix broke away from the parachute and fell freely, the whistle became extremely harsh, and then the landing recoil engine was turned on, and you could hear sounds similar to those made by robots.

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Regarding the increasingly sharp whistle, the scientists' interpretation is this: It should be the Doppler effect when the European Mars Express flew over the Phoenix.

Just like when a train is coming from a distance, we will feel that the sound of the whistle is getting sharper and sharper. After the train passes, the whistle becomes lower and lower.

The sound of the Phoenix traveling through the Martian air is indeed much sharper than the sound on Earth, but the fact that it is getting sharper and sharper to the point of being ear-piercing is caused by the Doppler effect.

As for the fine raindrops heard, scientists initially speculated that it should be caused by dust or ions in the Martian sky hitting the Mars rover.

And today, the 'Pioneer', which uses 'tons' as the basic unit of mass, is equipped with more sophisticated sound recording equipment, which can hear various sounds more clearly.

The take-off sound of the 'Sky Pioneer' unmanned reconnaissance helicopter is very loud, but after being transmitted through the thin air to the sound recording device, and then converted into signals and transmitted to the Earth, and then converted from signals into sound, hundreds of millions of people hear a sharp 'buzzing' sound, and the sound is not loud.

Fortunately, they also heard a faint 'raindrop' sound when the landing equipment first entered the atmosphere, so they turned up the volume, and now the sound can be heard.

However, as the helicopter flies higher and higher, and only flies out a few tens of meters, people can no longer hear the sound.

In places with thin air, the sound propagation distance is so poor.

And the rest is the helicopter's several hours of travel time.

Although Tang knew who the four aliens were, the other earthlings didn't know, so he could only pretend not to know, and for this reason, he also formulated a complete set of contact methods.

According to the helicopter's single flight time, the landing site can fly directly to the location of the aliens, but everyone is not allowed to play like that. They must land and rest when approaching the location of the aliens, and fly over after the flight power is fully charged.

If they fly directly over, the helicopter will definitely enter a 'stiff' time of up to 30 minutes. In case of any interstellar diplomatic conflict, they will not be able to escape.

Therefore, it must be ensured that the helicopter's power to support flight is relatively sufficient, and if there is a problem, it can fly away immediately.

The alien spacecraft crashed. After long-term satellite monitoring, people found that they did not have extra flight equipment. It is likely that they would not be able to cause damage to the helicopter, and they would not be able to catch up with the helicopter's flight speed. The helicopter could escape, and then consider it in the long term.

This is a rare opportunity to contact aliens. Even if it is not led by themselves, no country wants to waste this opportunity casually, especially those countries that do not have space capabilities.

Yes, Tang is connected to the United Nations General Assembly this time, and his avatar also appears at the scene of the United Nations General Assembly, and the largest screen at the scene shows the live broadcast of this event.

If this contact goes wrong, there will be no business for most countries in the next contact.

After all, other countries will not broadcast globally like Navigator Company. Although they have signed an information sharing agreement, but without even a live broadcast, how much credibility can the shared information have?

This is contact with aliens.