Aristotle was correct. Aristotle was correct for objects on Earth but not in space. An object will keep moving unless an unbalanced force stops it. A moving object will eventually stop even though an unbalanced force keeps pushing on it.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Aristotle taught that a force was always required to keep an object moving. Which of the following states what Newton believed?
Possibilities:
- Aristotle was correct.
- Aristotle was correct for objects on Earth but not in space.
- An object will keep moving unless an unbalanced force stops it.
- A moving object will eventually stop even though an unbalanced force keeps pushing on it.

An object will keep moving unless an unbalanced force stops it.