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How long does it take for Chinese "Tianyan" fast to find aliens?

via:驱动之家     time:2020/5/12 20:52:28     readed:760

Human knowledge is like a circle, which is known inside and unknown outside. The more you know, the bigger the circle, the more you don't know.

This is a famous saying from Zeno, the ancient Greek philosopher, which still applies today. In just a few centuries, there has been a major paradigm shift in the field of astronomy, and human cognition of the universe has been deepening, but in fact, there are still countless beyond the scope of human understanding.

28 April 2020, China

But, uh,

China

To understand the vast universe, we must use tools.

In 1931, in the famous Bell laboratory, Karl guthe jansky, a radio engineer who was responsible for searching and identifying telephone interference signals, discovered a kind of radio interference with the maximum value every 23 hours, 56 minutes and 04 seconds.

中国“天眼”FAST

As Karl Guthe Jansky wrote in an article the following year, the signal of interference came from radio radiation in the Milky Way, which ushered in a new era in the study of celestial bodies using radio waves, one of the most important tools in astronomy

However, unlike ordinary telescopes used for concert star chasing, radio telescopes look like a huge pot.

Specifically, radio telescopes can be used to observe and study radio waves from celestial bodies, including directional antennas to collect radio waves, high-sensitivity receivers to amplify radio signals, information recording, processing and display systems, etc., which can measure the radio intensity, spectrum and polarization of celestial bodies.

It is worth mentioning that in the 1960s astronomy

In 1993, at the conference of the International Radio Science Union held in Tokyo, astronomers from 10 countries, including China, proposed to build a new generation of radio telescope, hoping to harvest more radio signals before the global electrical signal environment deteriorated beyond control.

In 1994, the concept of fast engineering was put forward. However, considering the huge amount of money and numerous scientific research personnel, it is not easy to build a radio telescope:

2001, FAST Pre-Research as the first batch of Chinese Academy of Sciences

In July 2007, the national development and Reform Commission approved the project proposal for the national major scientific and technological infrastructure of the 500m spherical radio telescope, agreed to include the fast project in the national high-tech industry development project plan, and the project entered the feasibility study stage;

In March 2011, the commencement report of fast project was approved, and the preliminary design and budget estimate of the project were approved by the Chinese Academy of Sciences and the people's Government of Guizhou Province;

On July 3, 2016, the main fast project in Pingtang County, Guizhou Province was successfully completed;

On September 25, 2016, fast was put into operation and began to receive electromagnetic waves from the depths of the universe;

On January 11, 2020, fast was successfully accepted by the state and put into operation;

As of March 23, 2020, fast has found and certified 114 pulsars;

On April 28, 2020, fast officially launched the extraterrestrial civilization search.

中国“天眼”FAST

The most accurate clock in the universe

According to Baidu Encyclopedia, China, which took nearly 26 years to establish, build and officially put into use

Extending China's space measurement and control capability from the geosynchronous orbit to the outer edge of the solar system will increase the downward speed of deep space communication data by 100 times.

The measurement accuracy of arrival time of pulsar is improved from 120 ns to 30 ns, and it becomes the most accurate pulsar timing array in the world.

The weak space signal is identified by 1Hz resolution diagnosis, which serves as passive strategic radar for national security.

Searching for alien signals

As Wang Qiming, chief technologist of FAST telescope, said:

Among fast's scientific goals, the most important is to find pulsars.

Lei Feng net understands that pulsar, literally, is a neutron star that continuously sends out electromagnetic pulse signals.

So, what is a neutron star?

In fact, a black hole is a point with no size but mass, so the density is almost infinite. And neutron stars (neutron star) are the most dense stars except black holes. The formation of neutron stars and black holes is simila

On October 1967, a 24-year-old graduate student Jocelyn Bell Burnell found a pulsar PSR1919 in a laboratory at Cambridge University This is also the first pulsar to be discovered in human history.

It is understood that because pulsars send signals with strict periodicity, so it is considered the most accurate clock in the universe, because of its mystery, many netizens also added it

As mentioned above, at present, there are 114 pulsars discovered and certified by fast telescope, and the force is obvious.

中国“天眼”FAST

Can we find aliens?

And it is worth our attention that FAST have an important task

According to the National Astronomical Observatory of the Chinese Academy of Sciences, in September 2018, Zhang Zhisong, a doctoral student of the National Astronomical Observatory, cooperated with Professor Dan werthimer, Beijing Normal University and other units to install and test the high-resolution SETI backend at the fast site. In July 2019, the researchers analyzed and processed the drift scanning data, realized the frequency resolution of 4Hz, and successfully removed most of the RF interference, screened out multiple groups of narrow-band candidate signals, laying a solid foundation for the search of extraterrestrial civilization.

On April 28, 2020, fast officially launched the extraterrestrial civilization search.

However, even if fast is of extraordinary strength, there is no conclusive evidence to prove the existence of aliens all over the world. Finding aliens is likely to be something we can't witness in our lifetime.

As Liu Boyang, a professor of Astrophysics and a high praise respondent, said: Although we are full of expectations for fast's future in the field of search for extraterrestrial intelligence, we still do our best to listen to the fate of heaven, that's all.

Lei Feng has previously reported that the history of exploring extraterrestrial intelligence can be traced back to the 1960s:

In 1960, human beings began to receive and analyze various possible radio waves from space, hoping to find clues about extraterrestrial civilization;

NASA called on astronomers to search for SETI signals in 1971

In 1984, SETI Institute, a non-profit research institution in California, was established as the main research contractor of NASA and national science foundation;

In 1999, the University of Berkeley launched

中国“天眼”FAST

In addition, Hawking warned

Regardless of the cost of time, capital, human resources or technical level, whether we can find aliens or whether they will pose a threat to us is a mystery.

Lei Feng noted that there are a variety of online statements, many of whom also believe that the initiative to find aliens should be cautious

Is the universe venting its energy?

On April 30, 2020, fast telescope first discovered a new fast radio burst about 8.5 billion light-years away from the earth.

According to the National Astronomical Observatory of the Chinese Academy of Sciences, researchers Zhu Weiwei, Li Di, etc. and their collaborators use the search technology developed by themselves, combined with in-depth learning, to quickly search massive fast data, and new fast radio bursts can be found.

中国“天眼”FAST

It is worth mentioning that this is the first FRB discovered by fast telescope blind search. This transient flash occurred in the deep space of the universe. After a long journey of 8.5 billion years, it finally reached the earth on November 23, 2018.

In fact, the fast radio burst (FRB) is a short and violent burst of radio waves in the universe. Its duration is very short, but the energy released is equivalent to the energy released by the sun in a whole day.

Canadian astrophysicists Victoria Kaspi praised for their use in 2019

For FRB, at the moment

It's not hard to find that whether it's a pulsar, an alien, or a fast-moving radio storm, it's often only a question mark. After all, in the long river of the universe, we are just short waves.

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