Historical models of the solar system include a or earth-centered universe and a or sun-centered universe.

First Blank  - Geocentric model

Second Blank - Heliocentric model

Explanation:

In a geocentric model, the earth is assumed to be at the center of the solar system and all other planets , sun and moon (earth's natural satellite) revolve around the earth.

While in a heliocentric model, the sun is assumed to be at the center of the solar system and all other planets including the earth and moon revolve around the sun in elliptical orbit.

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation: