Exploring the origin of the moon with new achievements Chengdu scientific researchers successfully simulated the "Moon Big Crane" experiment

Cover reporter Liu Qiufeng

On September 10, Mid -Autumn Festival. People appreciate the moon, eat moon cakes, and write poems for the moon ... Since ancient times, the moon and the Mid -Autumn Festival are accompanied, carrying romantic feelings.

But when you look at the bright moon, people have never forgotten the secrets of the moon. Recently, the scientific research team from Chengdu has achieved new scientific research results.

"With the powerful computing power of Chengdu Supercomputing Center, we have some new research results in studying the origin of the moon." Zhou You, an associate professor of the Planet Science Center of Chengdu University of Technology, told reporters that they broke through the technical bottleneck of the big collision simulation of the moon. For the first time in my country, high -resolution planets based on SPH (smooth particle fluid dynamics) methods formed large collision simulation research.

About the origin of the moon

This is a "ultra -high -definition" simulation

"How does the moon formed?" "How did the early Earth's atmosphere lost?" When looking up at the starry sky, the Chengdu Institute of Technology Liu Yun and the Zhouyou team were committed to finding the answers to find these ultimate propositions.

Regarding the formation of the moon, the most widely accepted theory is the "big collision theory". Tour the shooting.

Regarding the formation of the moon, the most widely accepted theory is the "big collision theory". The doctrine believes that about 4.4 billion years ago, a Mars -sized object hit the earth that had just been formed. After the impact, a large amount of substances from the planet and the earth were sputtering into space, and the moon was eventually gathered.

"We simulate a planet with a quality of 0.13 times the earth. At a speed of 9.3 kilometers per second, the original earth collided, and the angle of collision was 46 degrees." Zhou You said that this is a low -speed impact, which calculates the temperature after the impact. (Kaishi temperature) About 30%of the original earth atmosphere was eroded.

This is a research on the planet, involving many parameters such as gravity, speed, temperature, density, etc. The changes of each parameter will affect the changes of subsequent parameters. The increase in resolution will bring the calculation amount to exponentially increase. This time, the Zhouyou team cooperated with the Chengdu Supercomputing Center to support with the help of strong computing power, and to debug cooperation with the Chengdu Supercomputing Center engineers to get a good experimental result.

SPH simulation moon formation

"This is a particularly high -resolution simulation, more than 10 million particles." Zhou You told reporters that better resolution can be deepened to many details. This is also the first time in China to develop a high -resolution SPH collision simulation to distinguish it. The rate reaches 12 million particles.

Zhou You said that the results of this research are forming a dissertation and are expected to be released this year or next year.

The moon shot by Zhou You

Know more:

Mid -Autumn Festival "Fifteenth Moon Fifteenth Fifteen Circles" this year

The folk has "the sixteenth moon round", but this year's Mid -Autumn Festival will be the "fifteenth moon of the fifteen".

The July, August and September of the lunar calendar are autumn, and August 15th of the lunar calendar is called "Mid -Autumn Festival" in the middle of the autumn. In the process of turning around the earth for a week, the full moon does not necessarily appear on the fifteenth lunar calendar, but may appear between the 14th and 17th lunar calendar. Therefore, the Mid -Autumn Festival does not necessarily catch up with the most round time of the moon.

According to public reports, astronomical popular science experts believe that the most round time for the full moon in the Mid -Autumn Festival this year is 17:59 on September 10. Therefore, in the evening of this year's Mid -Autumn Festival, it is the best time to see a round of full moon.

- END -