Which describes one way that Aristarchus's explanation of the movement of objects in the sky was different from other scientists' earlier explanations? He discovered Venus’s phases. He argued that Earth rotates on its axis. He explained the concept of retrograde motion. He described the epicycles of the planets in the sky.

The correct option is;

He argued that Earth rotates on its axis

Explanation:

The hypothesis that the Sun is at the center of the universe and the Earth, the other planets and other heavenly bodies are revolving around the Sun was first proposed by Aristarchus of Samos who also believed that the motion of the stars where actually due to the rotation of the Earth about its axis

However, the propositions where rejected at the time because it was contrary to perception and senses such that a revolving Earth has to have a moving "great wind" in the air around us

Aristarchus's explanation of the movement of objects in the sky was different from that of other scientists because he argued that Earth rotates on its axis.

The solar system was deeply studied by the early astronomers. Each of them offered an explanation for the movement of objects in the sky. Some of these postulations were inconsistent with scientific evidence.

However, Aristarchus postulated that the sun is at the center of the solar system and that the earth and other planets move round the sun in orbits.

Hence, he suggested that the sun and not the earth was at the center of the solar system.

Learn more; link