which are features of copernicus's model of the solar system select the three correct answers

Question

earth is fixed to a crystalline sphere

the sun is at the center

all planets orbits the sun at the same speed

the planets move in perfect circles

the stars are fixed to an outer space

the outer planets move in epicycles

Answer 1

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

1. The sun is at the center.
2. The stars are fixed to an outer space.
3. The outer planets move in epicycles.

Note: While Copernicus advanced the idea that planets move around the sun, he still retained some aspects of the Ptolemaic system, such as the use of epicycles to explain planetary motion and the notion that orbits were circular rather than elliptical.