What is a planetary nebula? a. The bipolar jets ejected by a T Tauri variable. b

Question

What is a planetary nebula? a. The bipolar jets ejected by a T Tauri variable. b. A planet surrounded by a glowing shell of gas. c. The disc of gas and dust surrounding a young star that will soon form a solar system. d. The ejected envelope, often bipolar, of a red giant surrounding a stellar core remnant. On the H-R diagram, red super-giants like Betelgeuse lie a. At the bottom left. b. At the bottom right. c. At the top left. d. At the top right. Why do stars of larger mass live longer on the main sequence than stars of lesser mass? a. The massive stars have more hydrogen fuel b. The massive stars use their fuel more slowly c. The massive stars go through many stages of fusion d. None of the above: the statement in question is false. On the H-R diagram, white dwarfs like "Sirius B" and "Procyon B" lie a. At the top left. b. At the top right. c. Close to the Sun, near the center. d. At the lower left. In the H-R diagram, the bright blue-white stars that dominate the naked eye sky lie to the a. Top left. b. Top right. c. Middle of the main sequence. d. Top center. In terms of density, this star has the least density. a. Supergiant. b. White dwarf. c. Neutron star. d. Black hole. When a star's inward gravity and outward pressure are balanced, the star is said to be a. In gravitational equilibrium. b. In thermal equilibrium. c. In rotational equilibrium. d. In hydrostatic equilibrium. An object as massive than the Sun, but roughly the size of a city, is a a. Supernova remnant. b. White dwarf. c. Brown dwarf. d. Neutron star. What would happen if mass is added to a 1.4 solar mass white dwarf? a. The star would explode as a nova. b. The star's radius would increase. c. The star would immediately collapse into a black hole. d. The star would erupt as a carbon detonation (type l) supernova. When a "white dwarf" in a binary star system accretes enough mass so that it cannot support its own weight a collapse occurs raising the star's temperature high enough for carbon fusion to occur throughout the star resulting in a: a. Type I supernova. b. Type II supernova. c. RR Lyrae. d. Cepheid. What is one of the differences between Cepheids and RR Lyrae variables? a. All Cepheids have the same brightness, but RR Lyrae stars vary greatly in luminosity. b. The period-luminosity relation holds only for RR Lyrae stars. c. The pulsations of RR Lyrae stars are much less regular than those of Cepheids. d. The RR Lyrae stars have much shorter periods than Cepheids.

Explanation / Answer

70- c) the disk of gas and dust surrounding a young star that will soon form a solar system

71- d) at the top right

72- c) the massive stars go through many stages of fusion.

73- d) at the lower left

74- d) top center

75- c) neutron star

76- a) in gravtational equiblirium

77- d) neutron star.

78- a) the star will explode as a nova.

79- a) type I supernova

80- b) the period - luminosity relation holds only for RR lyrae stars.

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