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Does the star Betelgeuse, whose apparent magnitude is m = +0.5, look brighter or dimmer to us than the star Pollux, whose apparent magnitude is m = +1.1 ?
Draw an H-R diagramand sketch the regions occupied by main-sequence stars, giants, supergiants, and white dwarfs. Briefly discuss the different ways you could have labeled the axes in your graph.
How can observations of a visual binary lead to information about the masses of its stars?
If as star is a red giant, how does its surface temperature compare to that of the Sun?
How is the evolution of a main-sequence stars with less than 0.4 MSUN different from that of a main-sequence star with more than that mass?
What does it mean when an astronomer says that a star "moves" from one place to another on an H-R diagram?
What if the Sun were expanding into a red giant today? How might we cope with that change?