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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?

You discover a binary star system in which one member is a15M Sun main-sequence star and the other star is a 10M Sun giant. How do we believe that a star system such as this might have come to exist?

Which of the following correctly states the luminosity-distance formula?