In which portion of the spectrum is the core of the galaxy invisible? a. infrared b. visible c. gamma ray d. X ray e. radio
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In which portion of the spectrum is the core of the galaxy invisible?
a. infraredb. visiblec. gamma rayd. X raye. radio
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- 38. Many RR Lyrae stars are found in open clusters in the plane of the galaxy. True FalseWhat 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 aboveThe 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.
- What objects did Harlow Shapley use to figure out the extent of the Milky Way Galaxy and the location of its center? A. thick clouds of cold hydrogen giving off 21-cm radiation B. globular clusters C. HIl regions D.dust clouds E. gamma-ray burstsThe 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.