H-R Diagram

The Hertzsprung-Russell (H-R) diagram shows the relationship between temperature and absolute magnitude.

• 90% of all stars are main sequence stars
• blue stars have the highest surface temperatures
• the brightest main-sequence stars are also the hottest.
• the Sun is an average main sequence star, yellow in color
• as our Sun ages it will eventually become a red giant
• the Sun has an absolute magnitude of +5