front 1 A star’s apparent brightness is based on what? | back 1 Its absolute brightness and its distance from Earth |
front 2 Where on an H-R diagram are most stars located? | back 2 The main sequence |
front 3 What characteristics are plotted on H-R diagrams? | back 3 Luminosity versus surface temperature |
front 4 What letters are in the spectral class? | back 4 O B A F G K M |
front 5 What determines a star’s color, luminosity, and temperature? | back 5 Mass and composition |
front 6 What happens to stars when they begin fusing elements heavier than hydrogen? | back 6 They become giants or supergiants |
front 7 Which of the following characteristics CANNOT be determined using an H-R diagram? | back 7 Distance from Earth |
front 8 What is the easiest element for stars to fuse? | back 8 Hydrogen |
front 9 Where is our Sun on the H-R diagram? | back 9 Main sequence |
front 10 What is a star color? | back 10 Yellow, Blue, White |