Is one moon not enough for the earth? Sometimes, the earth will be a bit greedy, pulling asteroids into orbit and traveling together. Of course, this is rare, and only two “mini moons” have been confirmed to have briefly danced with the earth. The most recent one was on February 15, when astronomers from NASA funded Catalina sky survey discovered an asteroid, 2020 CD3. < / P > < p > this “mini moon” was captured by the earth’s gravity as early as 2015, and stayed with us until May 2020, and then burst into the universe again. < / P > < p > the other asteroid, known as 2006 RH 120, was also discovered by the Catarina sky survey, which left Earth’s orbit after orbiting the earth several times between September 2006 and June 2007. Is 2020 destined to be an extraordinary year? Following the discovery of 2020 CD3 in February, astronomers announced that they have detected another possible Mini Moon: 2020 so. < / P > < p > however, this 2020 so is not like an asteroid at all. To the disappointment of astronomers, the mini moon may not be the real moon. It is too slow to escape from the gravity of other stars. < / P > < p > at present, some theories believe that 2020 so is the rocket body of atlas centaur-d rocket, which was launched in 1966. The rocket was launched on September 20, carrying the lunar lander surveyor 2 to the moon. < / P > < p > 2020 so will be captured by earth’s gravity in October and will reach the closest point on December 1, within about 31000 miles. Astronomers will then be able to observe it more closely, assessing its shape and the kind of light it emits. < / P > < p > even if it’s part of atlas centaur-d, that is, space junk, it’s a piece of unusual and significant garbage. It has been hovering in the solar system for more than 50 years, and this time it comes home to remind us of the problem of space debris. Global Tech