"There are locations in our solar system where the gravitational forces of a planet and the Sun cancel out, allowing objects to exist there stably. These regions are known as Lagrangian points. Every Sun-planet combination has five such points (as do other pairs of bodies, like the Earth and the Moon), as you can see in the image up top. Astronomers have detected asteroids in some of the Lagrangian points around Jupiter and Neptune - these have been dubbed Trojan asteroids. These asteroids share the orbits of their planets, and they also help preserve vital clues about how our solar system formed."
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