The approximate diameter of the disk of the Milky Way is a. 8.0 A.U. b. 8.0 light-years. c. 80 light-years. d. 80,000 light-years. e. 80,000,000 light-years.
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The approximate diameter of the disk of the Milky Way is
a. 8.0 A.U.b. 8.0 light-years.c. 80 light-years.d. 80,000 light-years.e. 80,000,000 light-years.
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- In an open universe, the overall geometry of the Universe would be a. flat b. spherical c. hyperbolic2. A galaxy cluster has a galaxy behind it whose image we see as being smeared out and curved, with an angular radius of curvature on the sky of θE. The background galaxy is at redshift zgal and the cluster is at zclust. What is the mass of the cluster in solar masses? Give your response in scientific notation with one decimal place. (The Hubble constant is of course 70 km/s/Mpc, and you can assume the Hubble law for these low redshifts). Values: zgal = 0.11 zclust = 0.07 θE = 117.4 arcsecondsWhat is the only viable explanation for so much mass in so small a region at the core of our galaxy? a. a tight cluster of stars b. many neutron stars c. many stellar black holes d. a single massive black hole e. none of the above
- The first evidence for the dark energy was that: a. galaxies in clusters are moving too rapidly for the clusters to be bound. b. Cepheid variable stars showed that galaxies were farther away that thought. c. the cosmic microwave background spectrum was a perfect black body. d.Type Ia supernovae appeared dimmer than predicted by Hubble’s law. e.Einstein’s theory of gravity predicted that the Universe should collapse.The Sun is located in a. the center of the Milky Way Galaxy b. the bulge of the Milky Way Galaxy c. the halo of the Milky Way Galaxy d. the disk of the Milky Way GalaxyOf the following groupings of galaxies, the one that is largest in size is the a. Local Supercluster. b. Local Group. c. filaments and voids. d. Coma Cluster.