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Discovering the Universe

Physics & Astronomy

Quiz 19 :

Cosmology

Quiz 19 :

Cosmology

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The cosmological redshift in the light from distant galaxies is explained by which of these effects?
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Answer:

A

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Which scientist discovered that the equations he had derived predicted an expanding universe, then modified his equations to eliminate this expansion?
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Answer:

A

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When did Einstein originally introduce his theory of general relativity, including the cosmological constant?
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Answer:

B

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When Hubble did his early work on the expanding universe, he knew nothing about the cosmological redshift. He used the Doppler shift equations instead, but these gave him the correct answer. Why?
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Why is the universe expanding?
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Which of these BEST describes the universe as envisioned by Isaac Newton?
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Suppose an object is at rest and that it is emitting radiation. An observer at rest with respect to the object observes the radiation to be blueshifted from its original frequency. This blueshift can be caused by
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Which of these statements is a correct description of the expansion of the universe?
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Consider four different regimes of space in which distances between objects might be changing as a result of the general expansion of the universe: (1) distances between different parts of Earth; (2) distance between planets in the solar system; (3) distances between stars in the Milky Way; (4) distances between clusters of galaxies. In which of these regimes are the distances changing because of the universe's expansion?
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Einstein's general theory of relativity, as originally formulated without the cosmological constant, predicts a universe that
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When astronomers view a distant quasar with highly redshifted emission lines in its spectrum, this wavelength shift is a
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Why did Einstein introduce his cosmological constant into the original equations for general relativity?
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What is the "cosmological redshift"?
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The cosmological redshift of the light from very distant galaxies is caused by the
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Newton reached the conclusion that the universe must consist of an infinite expanse of stars because
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Which of these statements BEST describes the history of the cosmological constant?
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The farther away a galaxy is, the more its light is redshifted, as observed from Earth. This relationship between redshift and distance is caused by
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The expansion of the universe takes place
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What causes the cosmological redshift of photons that reach Earth from distant galaxies?
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What do cosmologists study?
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