In an imaginary universe, astronomers find that there are thousands of galaxies

Question

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 a. isotropic and homogeneous. b. isotropic and homogeneous. c. homogeneous but not isotropic d. neither homogeneous nor isotropic. e. lacking any evidence for the Big Bang. Astronomers use galactic redshift as a measure of a. gravity. b. luminosity. c. velocity. d. mass. e. distance. The inverse of the value of H_0 gives a measurement in a unit of a. time. b. mass. c. density. d. size. e. luminosity You observe the following three galaxies and measure their respective recession velocities: (A, 2, 100 km/s);.(B, 4, 400 km/s); and (C, 3, 050 km/s). Which of the following must be true about these galaxies? A is smaller than B. b. A has more star formation than C. c. B has more stars than C. d. B is farther than A. e. They are all members of the Local Group. Galaxies move away from us in all directions because a. the force of gravity increases with distance. b. the force of gravity weakens with distance. c. space is expanding. d. our galaxy has expelled all other galaxies. e. we are at the center of the expansion of the universe. Hubble's constant, H_0, represents the a. rate of expansion of the universe. b. speed at which galaxies are moving away from us. c. time it takes a galaxy to move twice as far away from us. d. size of the universe. e. amount of time since the Solar System formed. Choose the incorrect statement about Hubble's law. a. It allows us to measure distances to remote galaxies. b. It is one fundamental piece of evidence supporting the expansion of the universe. c. It provides information about the age of the universe.

Explanation / Answer

8.Astronomers use galactic redshift as a measure of distance

9.The inverse value of H0 gives a measurement in a unit of time

11.galaxies moves away from us in all directions because space is expanding

12.Hubble's constant, H0 represents the rate of expansion of the universe

13.Choose the incorrect statement about Hubble's law it provides information about the age of the universe

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