What could cause the rate of expansion of the Universe to slow down? a. All expa

Question

What could cause the rate of expansion of the Universe to slow down? a. All expansions just naturally slow down with time. b. The greater the distance between two objects (such as galaxies or superclusters), the harder it is to push them apart. c. The gravitational pull of all objects in the Universe on each other could slow down the expansion. d. Galaxies feel a kind of friction as they move through space, and this slows them down. 3. True or False: The Big Bang was an expansion of matter into empty space. True or False: The universe expanded by a factor of 10^50 during inflation, when the strong force separated from the electromagnetic and weak nuclear forces. True or False: Primordial nucleosynthesis refers to the Big Bang making all elements up to iron. True or False: Decoupling refers to interactions between matter and antimatter at the end of the Radiation Era. The discovery of the cosmic microwave background was important because a. it established a firm center of the Universe. b. it was experimental verification of a prediction from the Big Bang theory. c. it proved that astronomy at radio wavelengths was possible. d. its detection was a major advance in microwave testing. e. it showed the universe must be closed, with more than the critical density here. True or False: There is very little interstellar gas or dust in most elliptical galaxies. True or False: Most galaxies are members of some sort of cluster of galaxies. True or False: Collisions between galaxies have little effect on the individual stars. True or False: Type I supernovae can be used to determine distances to galaxies much better than type II supernovae. True or False: The expansion of the universe means that stars in our Milky Way Galaxy are getting increasingly farther apart. True or False: Stars in the Galactic disk came billions of years before stars in the Galactic halo. True or False: Most astronomers believe that the stars in the Galactic halo formed in protogalactic clouds (or dwarf galaxies) or during the merger of these protogalactic clouds (dwarf galaxies).

Explanation / Answer

2) (c) the gravitational pull of all objects in the universe on each other could slow down the expansion.

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