According to foreign media reports, from time to time, asteroids flying over the earth will be trapped by our gravity and fall into orbit around the earth. Of course, these rocks will only stay for a while, and eventually they will escape and continue to wander into the unknown. But for the duration of their stay, they will be seen as the earth’s “mini moon.”. < / P > < p > astronomers have recently discovered another object that could be the earth’s “mini moon.”. But it’s neither an asteroid nor something strange. In fact, scientists suspect it’s some kind of man-made thing that wandered in the cold and lonely space for many years and then returned to the earth’s arms. Scientists have confirmed two mini moons. One is 2006 rh120, which orbits the earth between September 2006 and June 2007; the other is 2020 CD3, which was captured between 2015 and 2016 and is expected to leave in May 2020. The first clue that 2020 so is not an ordinary asteroid is that its velocity is a little abnormally low. The flight speed of 2020 so is much slower than that of a typical asteroid. In general, the average speed of an asteroid is 18 kilometers per second. Even lunar rocks tilted into Earth’s orbit due to the influence of the moon’s surface are faster than 2020 so. < / P > < p > on the other hand, the orbit path of 2020 so is very similar to that of the earth, which is almost an earth year. Its orbit is less round than that of the earth, but it also has almost no off-axis tilt. < / P > < p > so, what is its origin? NASA expects the size of the object to be very similar to the size of the propeller detached from the Centaur rocket. The rocket sent an unmanned probe to the moon during the Explorer 2 mission. While on the way, the spacecraft will continue to leave the target position. If the thruster is released high enough, it will stay in space. Now it looks as if the Centaur rocket, launched in September 1966, is on its way home. The space program on earth is still too short, but scientists still want to know what will happen to a rocket going into space in more than half a century? < / P > < p > although 2020 so will not enter our atmosphere because it is too close to the earth, its slow pace may allow scientists to study it carefully. < / P > < p > spectroscopy may reveal what the surface of a rocket looks like today – for example, is the coating still there? Of course, after staying in space for so long, it must have been hit by dust or micro meteorites, so the status quo of rocket surface is expected. Scientists also want to know about the current reflection capability of rockets, and valuable information can help planners of future long-term space missions understand how long-term spacecraft in space will maintain the ability to reflect light. Spontaneous combustion at a Guangzhou Motor vehicle intersection and other traffic lights in Shenzhen