When is an object considered a planet?
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
When is an object considered a planet?

### Response:

To be considered a planet the object must have an orbit around a sun, have enough mass to form a mostly round shape, and must be the dominant gravitational force in the area with no other similarly sized objects that are not orbiting the object in question.