On the Basis of Its Appearance and General Properties, Which

Multiple Choice

On the basis of its appearance and general properties, which planetary body could be described as Earth's twin?

A) Mars; somewhat smaller but with a similar surface, a thin atmosphere, and clouds
B) Moon; somewhat smaller but having the same average density and geology
C) Pluto; similar size and density, a large moon, and probably life on its surface
D) Venus; about the same mass and diameter, dense atmosphere, and cloud-shrouded