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70.Suppose that each of the objects in the following list have the same mass. Which of the following listsis arranged in order of decreasingsizea)protostar, black hole, neutron star, white dwarfb)protostar, white dwarf, neutron star, black holec)white dwarf, black hole, neutron star, protostard)white dwarf, neutron star, black hole, protostare)black hole, protostar, white dwarf, neutron star
1171.The Big Bang theory was originallysuggested as a result of72.Which of the following is most accurate? The idea that the laws of physics are universal, that is, thatthey apply in the same manner everywhere in the universe became the prevailing belief73.Which process gave rise to most of the oxygen in this room74.One of the reasons for building the Hubble Space Telescope was to make detailed observations of theVirgo cluster of galaxies. Which of the following best characterizes these important observations?a)Because of its orbit, the Hubble Space Telescope dramatically extends the baseline for parallaxmeasurements, enabling precision distance measurement to galaxies in the Virgo cluster.b)The Virgo cluster lies at a distance at which it is not possible to see variable stars from Earth-basedtelescopes, but at which it is possible for a good space-based telescope to see them. The HubbleSpace Telescope thus enabled us to measure distances to galaxies in the Virgo cluster withreasonable precision.c)The Virgo cluster is large, but very distant and dim, and it is very difficult to see using Earth-basedobservations. We thus needed a space-based telescope to accurately measure the red-shifts ofgalaxies within this important cluster.d)The Virgo cluster is very large, but extremely distant. Its spectrum is so highly red-shifted thatnormal emission lines are almost exclusively in the near infra-red: We thus needed a space-basedtelescope to accurately measure the red-shifts of galaxies within this important cluster.e)To survey dark matter within this important nearby cluster we need to be able to see all the galaxiesin the cluster, including the very numerous, small, faint ones. We thus need an accurate accountingof the “visible” matter before we can determine the dark matter component, and hence we need aspace-based telescope to make an accurate survey of all the luminous matter.