Exam 3B - Binghamton University ASTR 114 | Latest

1) The Hertzsprung-Russell Diagram plots ________ against the spectral type or temperature. A) brightness or apparent magnitude B) mass C) distance D) size or density E) luminosity or absolute magnitude 1) 2) Which event marks the birth of a star? A) formation of the planetary nebula B) collapse of an interstellar cloud C) formation of a photosphere D) instability in an interstellar cloud E) fusion of hydrogen atoms into helium atoms 2) 3) Dr. Smith believes that the Hubble constant isH0 = 70 km/s/Mpc. Dr. Jones believes it isH0 = 50 km/s/Mpc. Which statement below automatically follows? A) Dr. Smith believes that the universe is older than Dr. Jones believes. B) Dr. Smith believes that the universe will someday stop expanding, while Dr. Jones believes it will expand forever. C) Dr. Smith believes that the Andromeda Galaxy (a member of our Local Group) is moving away from us at a faster speed than Dr. Jones believes. D) Dr. Smith believes that the universe is younger than Dr. Jones believes. E) Dr. Smith believes that the universe is expanding, but Dr. Jones does not. 3) 4) Every red dwarf star (M0.01MSun) that ever joined the main sequence is still there today. A) True B) False 4) 5) While more massive than most of its neighbors, the Sun is still technically considered a low mass star. A) True B) False 5) 6) It is now believed the majority of mass for most galaxies lies in their dark halos. A) True B) False 6) 7) A pulsating variable star with a period of 10 days would be a Cepheid having an absolute magnitude of -4.2. A) True B) False 7) 8) While examining the spectrum of a galaxy you find all the hydrogen lines are shifted to longer wavelengths. This galaxy is A) moving away from us. B) expanding explosively. C) moving towards us. D) not forming new stars. E) blue shifted. 8) 9) Shapley found that globular clusters are only found in the Galactic bulge. A) True B) False 9) 10) The brightest stars in a young open cluster will be A) red T-tauri stars still heading for the main sequence. B) massive blue stars at the top left on the H-R diagram. C) the core stars of planetary nebulae. D) red giants that are fusing helium into carbon. E) yellow giants like our Sun, but much larger. 10) 11) 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 orbi