Share the news to friends and circles of friends with wechat scanning QR code < / P > < p > on January 12. The latest research in the United States shows that before the formation of the earth and other planets in the solar system, the sun was once surrounded by huge dust rings similar to Saturn < p > NASA believes that these dust rings may prevent the earth from growing into a "super earth", that is, a giant planet about twice the size and 10 times the mass of the earth. Astronomers have found that about 30% of the sun like stars in the Milky way have a super earth around them < p > Figure 1: the false color image taken by the Atacama large millimeter wave / submillimeter wave antenna array shows that there are dust rings around the young star named hd163296 (not the sun), and the < / P > < p > Super earth appears in many star systems, bringing many pending problems to astronomers. Andr é izidoro, an astrophysicist at Rice University in the United States, asked in a statement: "if super earths are very common, why don't we have super earths in our solar system?" < p > to find out the answer to this question, izidoro and his colleagues created a computer model of the formation of the solar system, which was formed from the ashes of dust and gas collapse clouds called solar nebula < p > the simulation of izidoro et al. Shows that the "pressure bump" (or the high-pressure region of gas and dust) will surround the newborn sun. These high-pressure regions are likely to be generated when particles move towards the sun under strong gravity, heat and release a large amount of evaporated gas < p > the simulation shows that when solid particles evaporate into gas (called sublimation line), three different regions may be produced. In the region closest (or hottest) to the sun, solid silicates become gases; In the middle region, the ice is heated enough to become a gas; In the farthest region, carbon monoxide becomes a gas < p > izidoro et al. Found that solid particles such as dust sometimes hit these "bumps" and began to accumulate and form rings. Andrea isella, associate professor of physics and astronomy at Rice University and co-author of the study, said in a statement: "pressure bumps help collect dust particles, which is why we see halos." < p > if these "pressure bumps" do not exist, the sun will quickly devour these particles without leaving any seeds of planetary formation. "There must be something that prevents the sun from swallowing it so that the planets have time to form," isera said < p > Figure 2: this may be a halo diagram showing the structure of our solar system < / P > < p > over time, the gas and dust around the sun gradually cooled, and the "sublimation line" gradually approached the sun. This process allows dust to accumulate into asteroids, or asteroid sized planetary seeds, which may then gather to form planets. "Our simulations show that pressure bumps can concentrate dust, and moving pressure bumps can act as asteroid factories," izidoro said < p > izidoro said in his statement that the pressure bump regulates the amount of material in the inner layer of the solar system that can be used to form planets. According to the simulation, the ring closest to the sun becomes the inner solar system planets, namely mercury, Venus, earth and Mars. The middle ring eventually becomes an outer solar system planet, while the outermost ring becomes comets, asteroids and other celestial bodies in the Kuiper belt (the area outside Neptune's orbit) < p > more importantly, the researchers found that if they delayed the formation of the middle ring in the simulation, the super earth might form in the solar system. In this regard, izidoro said: "when the pressure bump is formed under these circumstances, a large amount of material has invaded the internal system and can form a super earth. Therefore, the formation time of the central pressure bump may be very important to the composition of the solar system." (small) < / P > < p >