An amateur astronomer is looking through a telescope and observes a planet with few moons, no rings, and a cratered surface. what is he most likely observing?
a. a solid inner planet
b. a gaseous outer planet
c. a solid outer planet
d. a gaseous inner planet

The right option is; a. a solid inner planet

He is most likely observing a solid inner planet. The inner planets include Mercury, Venus, Earth and Mars. They are smaller and rockier with solid surfaces. The inner planets have either few moons or no moons, and are without rings. They are composed chiefly of heavy metals such as iron and nickel.