Planetary orbits have the same plane. Planetary orbits are mostly elliptical in shape. Planets orbit at the same speed around the Sun. Planets orbit in different directions around the Sun.
I gave my students this multiple choice question: When studying planetary data, Jackie found some similarities and differences among the planets that make up the solar system. Which generalization is true about the orbits of the major planets in the solar system?

Only one answer is correct among these 4 choices:
- Planetary orbits have the same plane.
- Planetary orbits are mostly elliptical in shape.
- Planets orbit at the same speed around the Sun.
- Planets orbit in different directions around the Sun.

Could you tell me which one is correct?

Planetary orbits are mostly elliptical in shape.