Which are features of Copernicus's model of the solar system? Select the three correct answers.(2 points)

Question

Responses

The outer planets move in epicycles.
The outer planets move in epicycles.

The planets move in perfect circles.
The planets move in perfect circles.

The stars are fixed to an outer sphere.
The stars are fixed to an outer sphere.

Earth is fixed to a crystalline sphere.
Earth is fixed to a crystalline sphere.

All planets orbit the Sun at the same speed.
All planets orbit the Sun at the same speed.

The Sun is at the center.

Answer 1

The three correct features of Copernicus's model of the solar system are:

1. The stars are fixed to an outer sphere.
2. The Sun is at the center.
3. The planets move in perfect circles.

(Note: "The outer planets move in epicycles" is not a feature of Copernicus's model; this was a feature of the Ptolemaic model. Also, the statement about Earth being fixed to a crystalline sphere is incorrect in the context of Copernicus’s heliocentric model, as Earth is one of the planets in motion around the Sun.)