The earth will interact with other celestial bodies in outer space, including the sun and the moon. At present, the time required for the earth to go around the sun is 366.26 times that of its rotation. This time is called sidereal year, which is equivalent to 365.26 solar days. The inclination of the earth's axis is 23.4 (perpendicular to the orbital plane is 23.4), which leads to the seasonal variation of the planet's surface with the period of 1 sidereal year. The moon is the only natural satellite, which was born on the moon 4.53 billion years ago, causing tidal phenomena on the earth, stabilizing the inclination of the earth's axis and slowing down the earth's rotation;

About 38 to 465,438+billion years ago, the asteroid impact in the later stage of the big bombing greatly changed the surface environment.

Scientists believe that the moon was born when the earth collided with an object the size of Mars about 4.5 billion years ago. Jack Lissauer, a member of the research team and a member of the Ames Research Center of the National Aeronautics and Space Administration of California, said: "A huge impact that may lead to the formation of the moon will throw a lot of materials into the earth's orbit, and some of them will just enter the Lagrangian point of the earth and the moon."

Lissord and john Chambers, co-author of the research report, said that once captured, Trojan satellites may stay in their respective orbits for as long as 654.38 billion years. After that, the gravitational drag from the planet changed the earth's orbit, eventually causing these "small satellites" to break down and slowly get out of orbit or hit the moon and the earth.