Why are there two different types of planets in the solar system? A)The amount of material available to form planets was greater in the outer reaches of the protoplanetary disk.

B)Rocky material could not collect and form planets beyond the asteroid belt.

C)The nebular cloud from which the solar system formed had very little gas.

D)The sun’s heat allowed only rocky planets to form in the inner portion of the solar system.

The correct answer is D. The heat from the sun allowed only rocky planets to form in the inner part of the solar system.

Explanation

The inner solar system is the name of the region that includes the inner planets that are characterized by being terrestrial in type, have dense and rocky compositions, few or no moons, and there are no ring systems. Another of its characteristics is that Venus, Earth, and Mars have enough atmosphere to generate climate. On the other hand, the region of the outer planets includes the four most distant planets from the sun, located beyond the asteroid belt, that is, Jupiter, Saturn, Uranus, and Neptune that are characterized by rotating at high speed, have gaseous surfaces, and rings around them (the most notable example is Saturn).