Question

1. what feature makes our solar system a heliocentric solar system?

all the planets revolve around the sun.
all the planets have a retrograde rotation on their axis.
all the planets revolve around earth.
all the planets in revolve around their own moon.

Explanation:

The heliocentric model posits that the sun is at the center of the solar - system and planets revolve around it. Retrograde rotation is not a defining feature of a heliocentric system. The geocentric model has Earth at the center, not the heliocentric one. Planets do not revolve around their moons in the context of what makes a heliocentric system.

Answer:

All the planets revolve around the sun.