# Astronomy The Solar System

Physics & Astronomy

## Quiz 21 :The Expanding Universe

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That "the physical laws and the properties of the universe are the same everywhere and in all directions" is a statement of
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D

If a scientist in the distant Andromeda Galaxy studies the hydrogen gas in that galaxy, they will measure ________ what a scientist in our galaxy would measure, studying hydrogen gas In the Milky Way.
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E

An implication of the cosmological principle is that our location in the universe is
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A

What do astronomers mean when they say that the universe is homogeneous?
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What do astronomers mean when they say that the universe is isotropic?
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In an imaginary universe, astronomers find that there are thousands of galaxies within a few million light-years in all directions, but beyond those galaxies there is nothing but empty space.Such a universe would be
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Sailors could claim the distribution of islands in the ocean is both homogeneous and isotropic (as far as they can see) if
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According to Hubble's law, as the distance of a galaxy ________ its ________ increases.
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If we lived in a galaxy 1 billion light-years from our own, what would we see?
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As measured from Earth, the spectrum of the galaxy NGC 7512 reveals a receding velocity of about 7,000 km/s.If an observer in that galaxy takes a spectrum of the Milky Way they would Measure ________.
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You measure the redshift of a distant galaxy and find, using Hubble's law and assuming a Hubble constant of 70 km/s/Mpc, that its distance is 1 billion ly (310 Mpc).Imagine that an observer in that galaxy is measuring the recession speed of the Milky Way at the same time as your measurement.What would be the speed that the remote alien observer would record?
Multiple Choice
All distant galaxies appear to be moving away from us.Does this mean we are in a special place, and why?
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Galaxies move away from us in all directions because
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Where in the universe did the Big Bang take place?
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Astronomers use galactic redshift as a measure of
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If the distance of a galaxy at a redshift z 0.05 is 220 Mpc, how many years back into the past are we looking when we observe this galaxy?
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