It is not yet known whether we live in an unbounded universe that will expand forever or in a bounded universe that will eventually recollapse. How are astronomers trying to settle this question?
A) by accurate measurement of the speed of a galaxy of known distance at two different times, to measure the deceleration directly
B) by measuring the curvature of space by tracing photon paths to Earth from distant galaxies
C) by determining how much galaxy speeds depart from a straight-line Hubble relationship, v = H0 d, at large distances
D) by careful observations of the size of the irregularities in the cosmic microwave background radiation
Correct Answer:
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