Which observations of the radiation from quasars indicate that they are physically very
small objects compared to galaxies?
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rapid fluctuations in output, often in less than one day
Many rich, regular clusters of galaxies contain substantial amounts of very hot,
intergalactic gas. Where is this gas believed to have come from?
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collisions between galaxies in the cluster
, The method used by Hubble to determine the distance to the Andromeda Galaxy
(M31), thereby establishing the concept of separate and individual galaxies
throughout the universe, was the
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observation of Cepheid variable stars.
In the verification of the Hubble law for the expansion of the universe and the
determination of the constant Ho, the greatest difficulty has been
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accurate determination of distances to very distant galaxies.
The width (Doppler broadening) of the 21-centimeter line in a spiral galaxy is related
to each one of the following properties of the galaxy except one. Which is the
exception?
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age
If most of the mass of a galaxy is located near the center of the galaxy, then in the
outer part of this galaxy we would expect the orbital speeds of stars to decrease with
increasing distance from the center. This is an example of
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small objects compared to galaxies?
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rapid fluctuations in output, often in less than one day
Many rich, regular clusters of galaxies contain substantial amounts of very hot,
intergalactic gas. Where is this gas believed to have come from?
Give this one a try later!
collisions between galaxies in the cluster
, The method used by Hubble to determine the distance to the Andromeda Galaxy
(M31), thereby establishing the concept of separate and individual galaxies
throughout the universe, was the
Give this one a try later!
observation of Cepheid variable stars.
In the verification of the Hubble law for the expansion of the universe and the
determination of the constant Ho, the greatest difficulty has been
Give this one a try later!
accurate determination of distances to very distant galaxies.
The width (Doppler broadening) of the 21-centimeter line in a spiral galaxy is related
to each one of the following properties of the galaxy except one. Which is the
exception?
Give this one a try later!
age
If most of the mass of a galaxy is located near the center of the galaxy, then in the
outer part of this galaxy we would expect the orbital speeds of stars to decrease with
increasing distance from the center. This is an example of
Give this one a try later!
