Why does the spectrum of a star contain dark lines?

• It absorbs certain wavelengths of light
• It emits certain wavelengths of light
• Certain wavelengths of light are missing
• Those wavelengths do not exist

Who devised the Harvard Classification System to classify stars?

• Annie Jump Cannon
• Galileo Galeli
• Albert Einstein
• Edward Pickering

How would you classify Star #1?

• A

• B

• F

• K

How would you classify Star #4?

• A

• F

• K

• M

What color is a Class M star?

• red

• black
• orange
• yellow

The Sun is classified as class G. What is most likely its surface temperature?

• about 5,000 K
• about 25,000 K
• about 3,000 K
• about 11,000 K

What COLOR would star #5 be?

• Red

• Orange

• Yellow

• Blue

What elements are found in star #8?

• Calcium and Helium

• Calcium and Iron

• Iron and Sodium

• Hydrogen and Helium

Which star is the HOTTEST?

What does it mean when the spectral lines are redshifted?

• Lines are shifted towards the red end of spectrum; the star is moving away.
• Lines are shifted towards the red end of the spectrum, the star is approaching
• Line are shifted towards the blue end of the spectrum, the star is moving away
• Lines are shifted towards the blue end of the spectrum, the star is approaching