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Which type of binary can have their sizes measured directly by photometry?

This diagram shows the life tracks from protostar to the main sequence for several stars of different masses. Which track represents the star that takes the longest amount of time to reach the main sequence?

A radio telescope and an optical telescope of the same size have the same angular resolution. 

This diagram represents an edge-on view of our Milky Way Galaxy. Of the four labeled stars, which one is located in what we call the halo of the galaxy?

Suppose a particular star has a core that is undergoing several stages of fusion simultaneously, as shown in this diagram. Based on your understanding of stellar lives, the mass of this star is probably ____________.

This famous image from the Hubble Space Telescope shows what is sometimes called the “pillars of creation.” Which of the following best describes what it shows?

What is happening inside a star while it expands into a subgiant?

About how many stars can be seen from somewhere on Earth with the naked eye?

What species absorbs photons in a protostar’s outer layers?

This is the H-R diagram for stars in a 12-billion-year-old globular cluster. Based on our understanding of stellar lives, which of the four labeled stars is currently generating energy through hydrogen fusion in a shell around an inert (nonburning) helium core?