Hubble\'s Law 157 6) Explain how the Hubble plot shown in Figure 2 is consistent

Question

Hubble's Law 157 6) Explain how the Hubble plot shown in Figure 2 is consistent with the relationship you described in Question 4 7) Imagine the Hubble plot shown in Figure 2 represents a universe that doubles in size over a certain amount of time. Which of the Hubble plots shown in Figures 3 and 4 below might represent a universe that triples in size over the same amount of time? Explain your reasoning. Distance Distance Figure 3 Figure 4 The expansion rate of the universe determines how fast the universe increases in size with time. For example, a universe that is tripling in size has a faster expansion rate than a universe that is doubling in size over the same amount of time. In a Hubble plot, the expansion rate is indicated by the slope of the graph. A steep slope indicates a fast expansion rate, while a flat slope indicates a slow expansion rate. 8) Would you say the expansion rate for the universe represented in Figure 2 is constant increasing, or decreasing with time? Explain your reasoning.

Explanation / Answer

7)

Since redshift velocity increases at a faster rate with distance in figure 3 plot than in figure 4, Figure 3 will represent a universe that is expanding at a higher rate. Also you can see that slope of plot is steep in figure 3 and flatter in figure 4, so figure 3 represents higher expansion rate.

So, figure 3 plot might represent a universe that triples in size in the specified amount of time.

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