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ASTR 107 Exam 3 Study Guide

Roman Jordan 19 Fragen

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  1. 1What does it mean that the universe is homogenous?
    1. AThe universe looks the same from every perspective
    2. BGalaxies are generally distributed evenly throughout the universe
    3. CAll stars in all galaxies have planetary systems just like ours
    4. DThe universe has looked the same at all times in its history
  2. 2What do astronomers mean when they say that the universe is isotropic?
    1. AMore distant parts of the universe look just like nearby parts
    2. BIntergalactic gas has the same density everywhere in the universe
    3. CThe laws of physics apply everywhere in the universe
    4. DThe universe is the same in every direction
  3. 3Cosmological redshifts are calculated from observations of spectral lines from
    1. Aindividual stars in different galaxies
    2. Bclouds of dust and gas in different galaxies
    3. Cspectra of entire galaxies
    4. Drotations of the disks of distant galaxies
  4. 4Astronomers observe that all galaxies are moving away from the Milky Way. According to the cosmological principle, this observation suggests that
    1. Athe Milky Way is at the center of the universe
    2. Bthe Milky Way must be at the center of the expansion
    3. Cthe Big Bang occurred at the current location of the Milky Way
    4. Dan observer in a distant galaxy would make the same observation
  5. 5Some galaxies have redshifts (z) that if equated to Vr/c correspond to velocities greater than the speed of light. Special relativity is not violated
    1. Abecause of relativistic beaming
    2. Bbecause it's a trick of the measurement angle
    3. Cbecause redshifts carry no information
    4. Dbecause those velocities do not measure motion through space
  6. 6The Big Bang theory predicted
    1. Athe Hubble law
    2. Bthe cosmic microwave background radiation
    3. Cthe cosmological principle
    4. Dthe abundance of helium
    5. Ethe period-luminosity relationship of Cepheid variables
  7. 7The simplest way to estimate the age of the universe is from
    1. Ausing the slope of Hubble's Law
    2. Bthe age of Moon rocks
    3. Cmodels of stellar evolution
    4. Dmeasurements of the abundances of elements
  8. 8The CMB includes information about
    1. Athe age of the universe
    2. Bthe temperature of the early universe
    3. Cthe density of the early universe
    4. Ddensity fluctuations in the early universe
    5. Ethe motion of Earth around the center of the Milky Way
  9. 9Repeated measurements showing that the current helium abundance is much less than the value predicted by the Big Bang would imply that
    1. Asome part of the Big Bang theory is incorrect or incomplete
    2. Bthe current helium abundance is wrong
    3. Cscientists don't know how to measure helium abundances
  10. 10If the density of the universe is higher than the critical density, the universe will
    1. Aexpand forever
    2. Bexpand, but gradually slow down
    3. Ceventually collapse
    4. Dneither expand nor contract

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Beschreibung
Ch 19-24
Sprache
English
Aufrufe
21
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