2021-03-31

Now that it is officially open to the world, how far can the “China Sky Eye” “see”?

By yqqlm yqqlm

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p > According to the National Astronomical Observatory of the Chinese Academy of Sciences, the “China Sky Eye” is China’s largest single-aperture and most sensitive radio telescope with independent intellectual property rights in the world today. Since the start of operation through national acceptance in January 2020, the “China Sky Eye” facility has been operating stably and reliably. The number of pulsars discovered has reached 300, and major breakthroughs have been made in research fields such as rapid radio bursts.

In line with the principle of open sky, “China Sky Eye” issued an invitation to astronomers all over the world at 0:00, Beijing time on March 31, 2021, to solicit applications for observations (login to http://fast.bao. ac.cn/proposal_submit view the notice and submit the application), all foreign application projects will participate in the review. The evaluation results of the solicitation project will be announced on July 20, 2021, and the observation time will begin in August 2021.

The National Astronomical Observatory of the Chinese Academy of Sciences stated that the “Chinese Sky Eye” will provide research facilities to the world with a more open attitude, provide more observational conditions for the world astronomy community, and contribute Chinese wisdom to build a community with a shared future for mankind. The development of world science and technology and the progress of human civilization.

According to the Southern + client news, whether it is “searching for extraterrestrial civilization” or detecting pulsars to explore the secrets of the origin of the universe, the “China Eyes” has always looked like Wrapped in a veil of mystery. Today, the reporter will take you to the past and present of the “Chinese Sky Eye” and ask how far the “Chinese Sky Eye” can “see”.

Now that it is officially open to the world, how far can the “China Sky Eye” “see”?

March 28 Panorama of “China Sky Eye” taken on Japan (taken during maintenance, drone photos).

How big is the “Chinese Sky Eye”?

“Sky Eye”, also known as FAST (Five-hundred-meter Aperture Spherical Radio Telescope), is the abbreviation of 500-meter spherical radio telescope. It is located in the karst pit of Dawodang, Kedu Town, Pingtang County, Qiannan Buyi and Miao Autonomous Prefecture, Guizhou Province. It is a major national scientific and technological infrastructure, led by the National Astronomical Observatory of the Chinese Academy of Sciences. The most sensitive radio telescope with a caliber.

In fact, as early as 1994, Chinese scientist Nan Rendong put forward the idea of ​​building a “sky eye”. After a lapse of 17 years, on March 25, 2011, the construction of the “China Sky Eye” started, and it was put into use on September 25, 2016. On January 11 last year, the “China Sky Eye” passed the national acceptance and was put into formal operation.

Many netizens joked that “Sky Eye” is like a cauldron. Then, the following sets of data let us get a glimpse of the mystery of this cauldron:

Big-reflection The surface is composed of 4450 reflecting units, with a total area of ​​250,000 square meters, which is equivalent to the size of 30 standard football fields. If you think of it as a pot full of water, the capacity is enough for everyone in the world to get 4 bottles of water.

Smart——The 30-ton feed cabin is controlled by 6 steel cables and can be positioned in real time at an altitude of 140 meters and a scale of 206 meters.

Strong-can see more distant and faint celestial bodies, stars that it can find in 1 minute, even if the coordinates are provided to a 100-meter-caliber radio telescope, it will take 9 minutes for the other party to see it.

Precise-the measurement angle is accurate to 8 arc seconds on the 500-meter scale, and the positioning accuracy of 10 mm is required to achieve a maximum of 3.8 mm.

Now that it is officially open to the world, how far can the “China Sky Eye” “see”?(1)

March 28 Panorama of “China Sky Eye” taken on Japan (taken during maintenance, drone photos).

How strong is the “Chinese Sky Eye”?

On the eve of the National Two Sessions in 2021, Wu Xiangping, a member of the National Committee of the Chinese People’s Political Consultative Conference, an academician of the Chinese Academy of Sciences, and director of the FAST Science Committee, revealed that as of March this year, the “China Sky Eye” has found more than 300 pulsars.

Pulsars are rotating neutron stars. They are named after they continuously emit electromagnetic pulse signals. Their density per cubic centimeter is equivalent to the mass of 10,000 10,000-ton giant ships, which is unimaginable on Earth. In the world similar to the “water droplets” in the science fiction novel “Three-Body”, millisecond pulsars with stable pulse signals are selected from the pulsars, which are expected to be used in interstellar navigation in the future.

For example, if you want to go to Mars or even out of the solar system or the Milky Way, you can’t use GPS on Earth to navigate at all, but if you can know the location of many pulsars in the universe, you can use it. Positioning and navigation.

In 1967, mankind discovered the first pulsar; until 50 years later, Chinese people discovered the first new pulsar with their radio telescope FAST. The discovery of so many pulsars in such a short period of time shows the strength of “Sky Eye”. Wu Xiangping expects that this number will reach 1,000 in the next five years, and even the first pulsar outside the Milky Way can be found.

In addition, the timing accuracy of the “Sky Eye” pulsar is more than 4 times ahead of the international level, and it is expected to make a major breakthrough in the cutting-edge scientific detection of gravitational waves, which has attracted worldwide attention.

For the search of extraterrestrial civilizations, “Sky Eye” has installed special back-end equipment, which is mainly to screen out useful narrow-band candidate signals from the vast electromagnetic signals of “Sky Eye”, and combine the celestial bodies with Artificial signals are eliminated. The extraterrestrial civilization research team at the University of California, Berkeley, based on decades of experience in searching for extraterrestrial civilizations, worked with the National Astronomical Observatory of the Chinese Academy of Sciences to develop this set of specialized equipment tailored for the “Chinese Sky Eye”.

The posture of “Chinese Sky Eye” chasing aliens is related to its sky survey mode. In addition to quietly “peeking” at the sky with the help of the earth’s rotation, it can also secretly send “autumn waves” to specific target celestial bodies. “, repeated observations. After verification, the back-end equipment of “Sky Eye” is very effective. The high resolution makes this device very good at processing cosmic noise, and makes “Sky Eye” even more powerful in searching for aliens.

Experts said that as the world’s largest single-aperture telescope, FAST will maintain its world-class status in the next 20 to 30 years.

Now that it is officially open to the world, how far can the “China Sky Eye” “see”?(2)

March 29 The “Chinese Sky Eye” under the night shot in Japan.

How far can the “Chinese Sky Eye” “see”?

It can pierce “beyond light years” and refresh the sky map of the deep space of the universe; it can patrol the “traces” of the big bang and gain insight into the “past lives” of the universe…

“China “Sky Eye” has four major scientific goals:

◎To patrol the neutral hydrogen in the universe and study the large-scale physics of the universe to explore the origin and evolution of the universe;

◎Observe pulsars, Study the structure and physical laws of matter under extreme conditions;

◎Lead the international low-frequency very long baseline interferometry network to obtain the hyperfine structure of celestial bodies;

◎Detect interstellar molecules; search for possible Interstellar communication signal.

For these four goals, the “Sky Eye” is fully armed and has unprecedentedly expanded the “visible range” of human exploration of the universe-compared with the US “Phoenix” program, the 500-meter-caliber “China” “Sky Eye” can expand the patrol target of the sun-like star by at least 5 times, and the space volume that can be effectively explored far exceeds that of the most advanced radio telescope before.

The long-term vision of “Sky Eye” lies in its openness to the scientific community of all mankind:

From March 31st, scientists from various countries can submit online submissions to the National Astronomical Observatory Observation application, the applied project will be reviewed by the “China Sky Eye” Scientific Committee and Time Allocation Committee, and project selection suggestions will be made. All foreign application projects will participate in the review. The review results will be announced on July 20, and the observation time will start in August.

Let us all hope that, with the joint efforts of scientists from all over the world, the “Chinese Sky Eye” can lead mankind to “see” the universe we live in more clearly.

Now that it is officially open to the world, how far can the “China Sky Eye” “see”?(3)

March 28 A panoramic view of the “China Sky Eye” under the night shot on the day.

(The original title is “Chinese Sky Eye” Becomes “World Giant Eye”: Officially Opened to the World”, “From today, “China Sky Eye” can “see” how far? ” )