Here's why that's important:
* Color and Temperature: A star's color is directly related to its surface temperature. Red stars emit mostly red light, which has a longer wavelength and lower energy than other colors.
* Stellar Classification: Astronomers use a system called the spectral classification to categorize stars based on their temperature, color, and other characteristics. Red stars fall into the M spectral class, which is the coolest class.
Keep in mind that "cool" is a relative term when talking about stars. Even the coolest red stars are still extremely hot by human standards!
