Stars of the same spectral class are the same color and approximately the same temperature.

Here's a breakdown:

* Spectral Class: Astronomers classify stars based on their spectral lines, which are unique patterns of light emitted by different elements in the star's atmosphere.

* Color and Temperature: The spectral class is directly related to a star's surface temperature. Hotter stars are bluer, while cooler stars are redder.

Here's a common mnemonic to remember the spectral classes from hottest to coolest:

O B A F G K M

* O: Blue, hottest

* B: Blue-white

* A: White

* F: Yellow-white

* G: Yellow (like our Sun)

* K: Orange

* M: Red, coolest

So, for example, all stars classified as G2 (like our Sun) will be yellow and have a similar temperature.