What determines how long the star will last on the main-sequence? (choose any correct answer or answers)

What is the cause of temperatures in the outermost layers of the Sun, the layers above what is considered to be the surface of the Sun?

Explain what a sunspot is and how they form; what is it that causes the sunspots.

Find an HR diagram and use the HR diagram to answer questions. Be sure to number your answers (1-5). Which spectral type of stars would be at the upper right end of the diagonal line on the HR Diagram? What type of objects would be located in the upper right area above the diagonal line on the HR Diagram? Are the objects in the upper right area above the diagonal line relatively hot or cool? What is the name of the objects that are located in the lower left corner under the diagonal line on the HR Diagram? Describe where the Sun would be located on the HR Diagram. Be specific to demonstrate that you know exactly where the Sun would be on the graph.

Calculate the distance in light years to a star that has a parallax angle of 0.016 of an arcsecond.

A star named Teresa has a magnitude of 0 and a star named Beth has a magnitude of +3.5. Calculate the difference in brightness of the two stars. (3 points) State which star is brightest. (1 point)

Which of the following will not become a star?

Which stars spend the most time on the main-sequence, the least time being classified as a star?  

Name all layers of our Sun from the center to the outermost layer, including the layer we see during a solar eclipse.

Which spectral class of stars would be Red?