Exam 3A - Binghamton University ASTR 114 | Latest

1) The rotation curve of the Milky Way suggests that the majority of the mass of the Milky Way lies farther out than the Sun's orbit. A) True B) False 1) 2) Which of the following best describes the evolutionary track followed on the H-R diagram for the most massive stars (before the star undergoes a Type II supernova)? A) horizontally right, then forms a clockwise loop B) horizontally right, diagonally to lower left, then horizontally right C) diagonally to lower right, then vertical, then horizontally left D) vertically upward, along the left edge of the diagram E) horizontally right 2) 3) The Hertzsprung-Russell Diagram plots ________ against the spectral type or temperature. A) mass B) distance C) luminosity or absolute magnitude D) size or density E) brightness or apparent magnitude 3) 4) Spiral arms are regions of star formation, which accounts for their blue color. A) True B) False 4) 5) Shapley found that globular clusters are only found in the Galactic bulge. A) True B) False 5) 6) The Hubble constant divided into the number one gives a rough estimate for the age of the universe, or the "Hubble Time." A) True B) False 6) 7) While examining the spectrum of a galaxy you find all the hydrogen lines are shifted to longer wavelengths. This galaxy is A) moving towards us. B) moving away from us. C) not forming new stars. D) expanding explosively. E) blue shifted. 7) 8) Which event marks the birth of a star? A) instability in an interstellar cloud B) fusion of hydrogen atoms into helium atoms C) formation of the planetary nebula D) collapse of an interstellar cloud E) formation of a photosphere 8) 9) The period-luminosity relation is critical in finding distances with A) RR Lyrae stars. B) pulsars. C) Cepheid variables. D) trigonometric p