asteroids meteorites comets moons
I gave my students this multiple choice question: The orbit of Earth is almost circular and has a period of about 365 days. Compared to the orbit of Earth, which of these objects usually have highly elliptical orbits and can have periods of over 1000 years?

Only one answer is correct among these 4 choices:
- asteroids
- meteorites
- comets
- moons

Could you tell me which one is correct?

comets