Suppose you measure the red shifts of all the images produced by gravitational lensing, such as in Figure 34.12. You find that the central image has a red shill less than the outer images, and those all have the same red shift. Discuss how this not only shows that the images are of the same object, but also implies than the red shift is not affected by taking different paths through space. Does it imply that cosmological red shifts are not caused by traveling through space (light getting tired, perhaps)?
Suppose you measure the red shifts of all the images produced by gravitational lensing, such as in Figure 34.12. You find that the central image has a red shill less than the outer images, and those all have the same red shift. Discuss how this not only shows that the images are of the same object, but also implies than the red shift is not affected by taking different paths through space. Does it imply that cosmological red shifts are not caused by traveling through space (light getting tired, perhaps)?
Suppose you measure the red shifts of all the images produced by gravitational lensing, .You findthat the central image has a red shift less than the outer images, and those all have the same red shift. Discuss how this not onlyshows that the images are of the same object, but also implies that the red shift is not affected by taking different paths throughspace. Does it imply that cosmological red shifts are not caused by traveling through space (light getting tired, perhaps)?
What do the results from the Wilkinson Microwave Anisotropy Probe (WMAP) observations tell cosmologists?
Consider the following line element, ds^2 = −dt^2 + a^2(t) (dx^2 + dy^2) + b^2(t) dz^2, where a(t) and b(t) are distinct functions. State whether or not this line element obeys the Cosmological Principle, if applied to describe the universe on large scales. Justify your answer.
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