In Sun and Earth,____________is a primary body due to its_______.Group of answer choicesEarth,massSun,massSun, movementEarth,movement

The correct answer to the question is "Sun, mass."

Here's the reasoning behind this conclusion:

1. Understanding the Question: The question asks to identify which is considered a primary body between the Sun and Earth, and what characteristic makes it a primary body.

2. Definition of a Primary Body: In celestial mechanics, a primary body is often defined as a significant body around which other bodies (like planets) orbit. The Sun is considered the primary body of our solar system because of its substantial mass.

3. Mass as a Determining Factor: The Sun contains approximately 99.86% of the total mass of the solar system, which allows it to exert a strong gravitational pull on surrounding bodies, such as the Earth. In contrast, the Earth, being much less massive, is considered a secondary body in relation to the Sun.

4. Movement Consideration: While both the Sun and Earth move (the Earth orbits the Sun, and the Sun moves through the Milky Way galaxy), it is the mass of a celestial body that typically defines its role as a primary body in a solar system.

Thus, the most appropriate completion of the sentence is "Sun, mass."