Which of these objects have NOT been found in the Galactic Halo?
A) RR Lyrae variables
B) planetary nebulae
C) emission nebulae
D) Population II stars
E) globular clusters
C
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An eclipse season is the period of time during which the
a. moon crosses a node in its orbit. b. sun crosses a node in the moon's orbit. c. line of nodes crosses the moon's orbit. d. the moon is new or full. e. the moon is visible during the day.
Molecular Speeds: What is the average translational kinetic energy of an ideal gas at 819 K? The Boltzmann constant is 1.38 × 10-23 J/K.
A. 1.70 × 10-20 J B. 5.65 × 10-21 J C. 1.13 × 10-17 J D. 3.77 × 10-19 J
According to the theory that active galactic nuclei are powered by supermassive black holes, the energy released as light comes from
A) nuclear fusion in the accretion disk surrounding the black hole. B) gravitational potential energy released by matter that is falling toward the black hole. C) matter-antimatter annihilation occurring just outside the event horizon of the black hole. D) jets emerging from the accretion disk.
A circle is an ellipse with an eccentricity of ____
a. zero b. one c. two d. four e. eight