Objects that share an orbit with a planet or moon and occupy the stable Lagrange points are commonly known as what?

• A. Trojan asteroids
• B. Comets
• C. Satellites
• D. Kuiper Belt Objects

Answer: (A)

Trojan asteroids are small bodies that share a planet’s orbit around the Sun by sitting at the stable Lagrange points ahead of and behind the planet. These points, about 60 degrees along the orbit from the planet, create a balanced gravitational situation so the objects can remain there for long periods while orbiting the Sun with the same period as the planet. They aren’t moons of the planet; they’re co-orbital with it, traveling with the planet around the Sun. Jupiter’s Trojan asteroids are the most famous example, and other planets have them too. The other options don’t fit because comets aren’t defined by occupying those specific orbital spots, satellites orbit planets (not the Sun) and Kuiper Belt Objects reside far beyond the planets in a different region of the solar system.