Is the force that causes objects with mass to attract one another A. Speed
B. Momentum
C. Gravity

As the Average orbit of a planet, increases, the length of the year
A. Stays the same
B. Increases
C. decreases

What object, in our solar system governs the movement of the Celestial bodies in our solar system?
A. The planets
B. The moons
C. the sun ​

I really need help, thank you!

Question 1. (C. Gravity) Question 2 (A. Stays the same) Question 3. (C. The Sun)

Explanation:

Question 2: I say this because it depends on where the planets are orbiting. Because planets closer to the sun will always have shorter years and and planets farther from the sun will always have longer years.

The other two question Im am 100% positive Im correct. So if someone knows Im correct or incorrect on question 2 please comment the answer below!

(have a great day!)

allowed for the prediction of the properties of missing elements.