Question

copernicuss model of the universe differs from ptolemys because copernicus believed
a) earth orbits the sun but remains stationary on its axis.
b) the sun and earth share a central point from which the other planets rotate around them.
c) earth is still at the center but rotates on its axis.
d) earth rotates on its axis and orbits the sun.

Explanation:

To solve this, we recall the heliocentric model by Copernicus and geocentric by Ptolemy. Ptolemy thought Earth was at the center (geocentric). Copernicus proposed Earth rotates on its axis and orbits the sun (heliocentric).

• Option A: Earth isn't stationary on its axis (it rotates), so A is wrong.
• Option B: Copernicus' model has the sun at the center, not sun and Earth sharing a center, so B is wrong.
• Option C: Copernicus didn't have Earth at the center, so C is wrong.
• Option D: Matches Copernicus' heliocentric model (Earth rotates on axis and orbits sun).

Answer:

D) Earth rotates on its axis and orbits the sun.