What is a planet ?
The International Astronomical Union (IAU) defined in August 2006, that a planet in the Solar system is a celestial body that :
- orbits the Sun (the host star of the Solar system), 
- has enough mass to assume a hydrostatic equilibrium (nearly round) shape,
- is big enough that its gravity cleared away any other similarly-sized objects near its orbit around the Sun.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: What is a planet ?
### Input: 
### Response: The International Astronomical Union (IAU) defined in August 2006, that a planet in the Solar system is a celestial body that :
- orbits the Sun (the host star of the Solar system), 
- has enough mass to assume a hydrostatic equilibrium (nearly round) shape,
- is big enough that its gravity cleared away any other similarly-sized objects near its orbit around the Sun.