Remains of ancient “mini planets” in Mars’s orbit
The planet Mars shares its orbit with a few small asteroids called “Trojans”. Recently, an international team of astronomers have found that most of these objects share a common composition and are likely the remains of a mini-planet that was destroyed by a collision long ago. Trojan asteroids move in orbits with the same average distance from the Sun as a planet, trapped within gravitational “safe havens” 60 degrees in front of and behind the planet.