Peritonitis refers to:

This is Wright’s stain.  What is the term (not the name of the cell) to describe what the arrow is pointing to?

Tiny dust grains within the ISM are used to detect the earliest stage of star formation, an object called a (choose the best answer)

Which HR graph shows the oldest star cluster?  Star cluster X is missing several stars on the line at the lower end of the line and a few stars at the higher end of the line, with some stars to the right of the line Star cluster Y has all stars on the line for the lower half and all stars missing from the upper half of the line, with stars up and to the right of the upper part of the line Star cluster Z is missing a few stars at the lower end of the line and some stars at the higher end of the line, with stars up and to the right of the upper part of the line NASA Image of different age star clusters

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)