In the Hertzsprung–Russell diagram in Figure 12-7 in the text, which of these lists is the correct sequence of stars in order of DECREASING absolute magnitude?

What are the two MOST abundant elements in the interstellar medium?

The Hertzsprung–Russell diagram is a plot of

What is a star’s luminosity?

In connection with a star, what does the phrase “metal-poor” mean?

Neutron stars are believed to be created by

The detection of neutrinos from SN 1987A occurred 3 hours before the detection of the burst of visible light. What caused this time lag?

Cepheid stars are

Which of these mechanisms is NOT a common way in which star formation is triggered or started?

A white dwarf star is about the same size as