Which of these are part of our solar system? select all that apply.
a. the sun
b. moons
c. comets
d. polaris
e. planets
f. asteroids

I believe the answers are A, B, C,E, and F

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other

We can infer that star y is closer but other factors must be considered include the heat of the star, the mass, and the brightness of the star. even though star x seems dimmer it may just be less bright or contains less heat.