1 g 40 years ago, the United States sent 1g of lunar soil to China. 1969 July to 1972 February, the United States conducted seven manned missions to the moon, six of which were successful, and 12 astronauts landed on the moon and brought back about 38. 1970s, the Soviet Union retrieved ***330 grams of precious lunar soil through three unmanned probes: Moon 16, Moon 20 and Moon 24.

1978 After the establishment of diplomatic relations between China and the United States, brzezinski, the national security adviser of the United States, presented China with 1 gram of moon rock as a gesture of friendship-only 1 gram can be seen clearly with a magnifying glass.

Extended data:

The lunar soil sample presented by the United States to China is only 1g, which will be divided into two parts, half of which will be collected in the Beijing Planetarium and the other half will be used for research. With this 0.5g lunar soil, China scholars published 14 papers. If there are more moon rocks and soil, more and more meaningful moon research can be completed.

Can't, at that time, China didn't have the ability to get it on the moon, so he had to rely on others to send it out. Moreover, the lunar soil is an extremely precious thing for any country, and it is impossible to give it to you casually.

Because it has been 44 years since 1976, the last sampling of the Soviet "Moon 20" probe, that humans have not re-obtained the moon samples.

The reason is that the "month by month" competition between the United States and the Soviet Union is essentially a part of the arms race during the Cold War, so we can invest at all costs and start chasing again and again in that era when computers were as big as houses.