CC #26: Stars

What is the result when you separate the incoming light from an object into individual colors or wavelengths?

• Spectrum

• Color chart

• HR Diagram

• Photon analysis

In general, stars emit light at:

• All wavelengths

• Short wavelengths

• Long wavelengths

• Only very specific wavelengths

Who introduced a new system for classifying stars based on the strengths and appearances of many different absorption lines in their spectra?

• Annie Jump Cannon

• Cecelia Payne-Gaposchkin

• Max Planck

• Meghnad Saha

What did Cecelia Payne-Gaposchkin show about the composition of stars?

• Stars have the same composition as the Earth

• Stars have no specific composition

• Stars are composed of hydrogen and helium

• Stars are composed of nitrogen and oxygen

Stars are classified and assigned a specific letter. The category that they assigned is dependent upon their:

• Size

• Temperature

• Mass

• Composition

What is the order, from hottest to coldest, of the letter classifications used for stars?

• A, B, F, G, K, M, O

• O, M, K, G, F, B, A

• O, B, A, F, G, K, M

• M, K, G, F, A, B, O

Fill in the blank: Hotter stars appear _______, while cooler stars appear _______. Our Sun appears white (since it emits light of all visible colors which combine to make white light), but its spectrum actually peaks in the ______.

• blue, red, green

• green, blue, red

• red, blue, green

• blue, green, red

In an HR Diagram, stars are plotted based on which two of their characteristics?

• Size and Temperature

• Size and Luminosity

• Temperature and Luminosity

• Luminosity and Mass

What is the term used for the broad, long line on the HR diagram where most stars are located?

• Temperature Sequence

• Size Sequence

• Luminosity Sequence

• Main Sequence

What is the process by which stars generate energy in their cores for most of their lives?

• Fusion of hydrogen into helium

• Fission of hydrogen into helium

• Fission of helium into hydrogen

• Fusion of helium into hydrogen