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You discover a large star cluster that is missing all of its massive stars. What does that mean?Select one:You and your friend synchronize your watches (clocks). Then, your friendspends 1 week on the Moon. When your friend returns, you comparewatches again. What do you find?Select one:Two stars have identical luminosities (intrinsic brightness). However, whenobserved in the sky, star A is four times as bright (relative brightness) as starB. This means that star B isb. twice as far awayThe detection of ______ proves the heating source of the Sun?Why are Sunspots a darker color (i.e. cooler)?Select one:c. Magnetic fields suppress convection.A 3 solar mass black hole has an event horizon ofA binary system is discovered. All that we observed is that star A is a redgiant, and star B is a white dwarf. Which of the following do we NOT knowabout the system?Select one:d. cooler material is sinkingA 1 solar mass star is dead. How did it move on the HR diagram?Select one:a. Up to the left, then back down to the main sequence, then to the upper right, thendown to the bottom of the main sequence.
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Astronomy, White dwarf, main sequence, solar mass star, star Select