**temperature**is the measure of the speed at which the object’s particles move. To measure temperature, astronomers prefer the

**Kelvin temperature scale**. This scale is much like Celsius, but 0

^{o }is Absolute Zero – scale starts at zero, 0K.

**Wien’s Law**relates the color of an incandescent object to its temperature. The law states that wavelength of the brightest color is inversely proportional to the object’s temperature.

Where:

**λmax**is the wavelength of the brightest color**T**is the temperature

**Stefan-Boltzmann Law **states that the power, **P **, emitted per unit of area of an object is proportional to the fourth power of its temperature, **T **. Mathematically, this is:

Where:

**P**is the power**T**is the temperature