What is the hottest planet in the solar system?

What is the smallest planet in the solar system?

Which planet is the coldest?

Which planet used to be apart of the solar system, but now is not?

A model of Earth has a diameter of 10 cm. What would its circumference be, using the formula: C = 2 Pi R

Which of these planets are gas giants? Click all that apply.

Which of these planets are terrestrial(inner) planets? Click all that apply.

What is the first planet in our solar system closest to the sun?

Which planet is considered earth's twin?

Which planet has the heaviest and thickest atmosphere?

Select all that apply to the INNER planets

What other planets/ moons/ asteroids have humans themselves explored outside of earth? Click all that apply.