7. Understanding Figure 25 -18. Answer a -c using the bold-faced letters O-R in

Question

7. Understanding Figure 25 -18. Answer a -c using the bold-faced letters O-R in the diagram at right. a) Which area(s) represent a universe in which gravity is 2.s stronger than expansion? Gray arca: No Big Bang (density of matter cou never have been infinite) 2.0 b) Which area(s) represents a universe which is accelerating? 1.5 c) Which area(s) represents a universe that includes about 76% dark energy? Recent observations indicate that -0.24 and ^-0.76. 1.0 d) What three observations were made to create this figure and which, together, suggest we live in a Universe that is dominated by dark energy? 0.5 Universe expands forever Universe recollapses This model, for which Q, 1.00, and a, 0.00, has 0.5 been ruled out by obscrvations. 0.0 0.5 1.0 1.5 2.0 2.5 Matter density parameter

Explanation / Answer

a) In the area P, the gravity is stronger than expansion and because of stronger gravitational force, the universe recollapses in this region.

b) The areas above (O, Q) and below (R, P) of the line indicate that the universe is accelerating either to expand or to collapse. The solid line dividing these two fields represents the expansion of the universe at a steady rate.

c) Region O represents a universe that includes 76% dark energy.

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