Q: In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.
Question: If planet W and planet X have a combined mass that is half that of the combined mass of planet Y and planet Z, the gravitational force between planets Y and Z will be _____ that of W and X. 
 Answer: greater than
A:
The greater the mass of the objects, the stronger the gravitational force of attraction between them.