History of Human Space Exploitation

Chapter 16 Dreaming of Xiandu
In the 1 galaxy that passed through the 9-3-13-2931 star tunnel, since the star tunnel was deployed around 500 years of the cosmic era, and the front unmanned probe arrived for more than 100 years, few people have paid attention to it.This galaxy, which was later named Lop Nur, was as desolate and silent as the Gobi Desert with this name on Earth.

The main star of the Lop Nur galaxy is a brown dwarf with a mass of [-] times the sun.Since the star (after a long debate, the black dwarf is still classified as a star by the International Astronomical Council) has no nuclear fusion to generate a lot of energy, the five planets in the sphere of seven astronomical units centered on it are all permanent. A world of darkness and silence.

Due to the low mass and gravitational level of the brown dwarf itself, it is unable to accrete matter from the wider interstellar space, and the five planets orbiting it are all smaller solid planets, or directly dwarf planets.

The outermost planet of the Lop Nur galaxy was named Arno Robert after the 150th year after the galaxy was discovered, to commemorate the two people who discovered the cosmic microwave background radiation when humans were still living on the earth in the 60s Great, rigorous scientist.Such a naming is naturally because this planet has the important value and responsibility entrusted to it by human beings.

Arno Robert Star is a solid planet with a carbon content of about 90.00% [-] and a diameter of [-] kilometers.As we all know, because each carbon atom is connected with three other carbon atoms, six carbon atoms form a regular hexagonal ring on the same plane, stretching to form a sheet structure, so the planet is almost entirely composed of black graphite.

There are currently two explanations for why a galaxy dominated by brown dwarfs, like the Lop Nur galaxy, has a carbonaceous planet.One is that this galaxy originated from the relics of the previous generation of galaxies, and the main sequence stars of the previous generation of galaxies should have at least developed to the red giant stage. Unknown accidents occurred, and a star explosion occurred, and the interstellar matter aggregated after the explosion threw some matter into a new brown dwarf.Arno Robert stars, on the other hand, are direct relics of a previous generation of stars.

Another conjecture is that, after a distant supernova erupted, a carbonaceous spill came to the Lop Nur galaxy after being decelerated by unknown factors for many times, and because its own speed had dropped to a low level, it was able to be absorbed by a gravitationally weak brown dwarf star. Capture and enter orbit.

Using the names of Arno Penchias and Robert Wilson, the originators of radio astronomy, to name the largest radio astronomy and even astronomical observation project in history, of course, it is hoped that the names of the sages can bless and spur the new generation of astronomers to The boundaries of human cognition expand more territories.Radio astronomers are going to build the largest radio-band receiving primary mirror in history on the Arno Robert star, relying on the naturally formed crater with a diameter of 2000 meters and a depth of 190 meters.

Previously, scientists had searched for this project on no less than a thousand known galaxies and tens of thousands of asteroids, dwarf planets and general solid planets accessible to humans. However, after repeated investigations, the natural conditions of the Lop Nur galaxy It is the best of all candidates.

First of all, the region where the Lop Nur galaxy is located is currently known to be the sparsest region of galaxy clusters and galaxies in the Virgo supercluster.If the mass density of the entire observable universe is five or six hydrogen atoms per cubic light-year, then the average mass density of 50 cubic light-years around the Lop Nur galaxy is only [-] hydrogen atoms.

Second, since the brown dwarf itself does not have the characteristics of nuclear reactions, the electromagnetic, X-ray, neutrino, etc., and even close-range interferences in the infrared band that may be received by the Arno Robert star are minimal, which is a known dream for radio astronomers. The "radio clearance" is very close to the environment.

Third, because the planet itself is almost composed of carbon, there are almost no metal elements on the entire planet, so the interference of the magnetic field of the planet itself on cosmic rays and the interference on the reception of various radio signals is relatively negligible compared with metal-rich planets.

The Maxwell [-]-kilometer Aperture Spherical Radio Telescope, or MTAST for short, took eighteen months from planning to completion. During the commissioning stage after completion, an episode occurred.

When adjusting the sensitivity of the microwave section, the trainee data observer Xiao A and the trainee equipment operator Ella received signals with very similar encoding methods between 850 and 950Mhz.If these data are measured by time, they are emitted by hundreds of millions of emission sources in a span of more than ten years.

Little A and Ella, who showed great interest in this, tried several ways to decode the information.Among several decoding methods, they tried to use a similar decoding method to the baseband processor on the mobile communication device, and obtained complete decoding information.

After decoding these signals of varying quality, a very similar musical melody is obtained.In some low-quality signal sources, the tune can only show a few rough single tones that can form the melody, and due to long-term signal attenuation and deflection in space, the information of high-quality signal sources is also lost. Huge loss.However, no matter whether it is a high-quality or low-quality signal source, even when it is recorded or compiled into a signal in a very rough way, it cannot prevent the charm of this classic music that has been passed down for thousands of years.

Little A and Ella both took music theory as an elective in school, and they know that this passage can definitely be played from the 90s of the 21th century to the first decade of the [-]st century.The information that can be decoded by these signals on the earth points to the great composer of an era that is thought to be older than the end of the [-]th century-Ludwig van Beethoven (Ludwig van Beethoven).

Ludwig van Beethoven was born on December 1770, 12 and died on March 16, 1827. He was one of the greatest musicians and composers of the earth age. His works are still in the It has been performed by people on many occasions.Beethoven's deeds and all his works are included in the second volume of "The History of Human Universe Development".

This song was compiled into the waiting tone used by hundreds of millions of devices when people used mobile communication devices to call others at the end of the [-]th century, or the song called ringtone at that time. It may not be the most outstanding and most outstanding among all Beethoven's works. Great, but perhaps the most popular and influential of all his works.Little A and Ella are also music lovers. They wrote the following paragraph about the appreciation and analysis of this piece of music, and then sent it to the vast universe using the same frequency code, hoping to commemorate this great composer. great works.

"To Alice"

"Dedicated to Alice" was originally called "Bagatelle in A minor", an independent piano piece composed by Beethoven in 1810. It is believed that Beethoven dedicated it to "Alice" as a commemorative work.This work was discovered by later generations in 1867, and it was included in Addendum No. 25 of Volume 59 of "The Complete Works of Beethoven".

Section A of the work starts with the unharmonious minor second of the right hand and one hand. There are both tension and temptation in the elastic rhythm, and then enters a minor third chord. The melancholy and gloom of the minor key linger in the air for a while, like the black purple before the dawn The sky, and then the right hand plays the three tones of B, C, and D on the keys to lead the music to the relative major - C major, which is the B section.

At this time, the color of the music brightens, the sun is warming the tea, and the sky is clear, and it seems that the questions and melancholy have been answered in the affirmative.Of course, composers will show their extraordinary talents in their works, but they will also show their fragility, sensitivity, entanglement and even compulsion.Therefore, while experiencing the joy brought by the music, we must also accept the sadness, vulnerability and emotions that the composer, as a normal person, must have.The questions and answers in the works have never stopped, which requires the performer to have the ability of empathy and synaesthesia, as well as a certain theoretical analysis ability while mastering proficient performance skills.

While perceiving the composer's emotions, he can read his musical language, use different touch keys during performance, perform a role of question and answer, and make musical sentences with his wrist.Whether it is asking questions, hesitating, probing, answering, sighing or getting angry, there are accurate experiences and voice presentations.In section C, as the harmony texture becomes thicker and the vocal range widens, the left hand changes from a flowing and gentle accompaniment of broken chords to a strong unison accompaniment, which makes the author feel anxious and anxious, and the listener feels the same. Because of the large contrast with the previous beautiful and quiet, some listeners do not like this section C, but it is indeed the true expression of the composer's heart. After strong emotional fluctuations, the music gradually calms down and returns to section A, just like Finally reconcile with myself.

This paragraph of appreciation and analysis of "Dedicated to Alice" is broadcast by Little A and Ella to the whole universe in the form of binary open source code at a frequency of 900Mhz.Although the two of them love music very much, and they are already familiar with the bond between Xiong Yu and Xiong Yu who crossed the universe hundreds of years ago and were linked by classical music, but they naturally knew that they should write a basically professional analysis. It's a little difficult for myself.Little A and Ella looked through the articles on the analysis of the handed down work "For Alice" that existed in the database in the past 2000 years, and finally chose a Chinese music teacher whose abbreviation is SH living in the 21st century. , a short appreciation article on this Beethoven sketch published in mid-2021.

Yes, the author who wrote this appreciation and analysis of "For Alice" is that SH, the one who will always play the holographic image of "Rachmaninoff Prelude in C-sharp Minor" on the poet star.As we all know, the holographic image of playing the piano is in the place commemorating Dan Simmons and his great science fiction work "Hyberian". The latecomers hope to use music and physical statues to show the world "Rahmani" without stopping. Nove Prelude in C-sharp Minor" charming and one of the protagonists in the novel, the elegy of the unnamed overlord-consul to his home planet Maui and to his grandmother Shili.

Note: Cosmic Microwave Background radiation, Cosmic Microwave Background, referred to as CMB, also known as 3K background radiation, was accidentally discovered by ancient American radio astronomers Arnold Allan Penzias and Robert Woodrow Wilson in 1964 Discovery of a source of thermal radiation at a frequency of 2.725 Kelvin in the microwave range that fills the entire universe.

(End of this chapter)