7 - HR Diagram Basics

What is on the X-axis (bottom) of the HR Diagram?

• temperature

• luminosity

• color

• size

What is weird about the Temperature scale on the HR Diagram?

• it is backwards

• nothing

• the numbers are astronomical

What is on the Y-axis (up the left side) of the HR Diagram?

• temperature

• luminosity

• color

• size

What is a synonym for luminosity?

• brightness

• temperature

• color

• size

What two characteristics does the HR diagram classify stars by?

• luminosity and temperature

• luminosity and color

• size and color

• temperature and size

What two words could go in the blanks to describe star A?

• Bright, Hot

• Bright, Cool

• Dim, Hot

• Dim, Cool

What two words could go in the blanks to describe star B?

• Bright, Hot

• Bright, Cool

• Dim, Hot

• Dim, Cool

What two words could go in the blanks to describe star C?

• Bright, Hot

• Bright, Cool

• Dim, Hot

• Dim, Cool

What two words could go in the blanks to describe star D?

• Bright, Hot

• Bright, Cool

• Dim, Hot

• Dim, Cool

What is the correct sequence of colors from hottest to coolest?

• blue, white, yellow, orange, red

• red, orange, yellow, white, blue

• blue, red, orange, yellow, white

• white, yellow, orange, red, blue