1.The light from more distant galaxies is more redshifted because
a.more distant galaxies are traveling faster through space.
b.the photons have been traveling through expanding space for a longer time.
c.there is more absorbing matter between us and more distant galaxies.
d.there was a stronger gravitational redshift when the universe was younger and denser
2.If space is hyperbolic, then initially parallel light beams will subsequently
a.always remain parallel.
b.always converge.
c.always diverge.
d.either converge or diverge, depending on the curvature of space.
3.If the universe is closed, then parallel lines
a.will remain parallel no matter how far they extend.
b.will diverge away from each other as they extend into space.
c.will eventually come together and intersect as they extend into space.
d.are undefined.
Solution
1. Option b is correct (the photons have been traveling through expanding space for a longer
time.)
2. Option c is correct. (always diverge.)
3. Option C is correct (will eventually come together and intersect as they extend into space.).
UChicago CMSC 23320 - The Best Commit Messages of 2024
1.The light from more distant galaxies is more redshifted becausea.pdf
1. 1.The light from more distant galaxies is more redshifted because
a.more distant galaxies are traveling faster through space.
b.the photons have been traveling through expanding space for a longer time.
c.there is more absorbing matter between us and more distant galaxies.
d.there was a stronger gravitational redshift when the universe was younger and denser
2.If space is hyperbolic, then initially parallel light beams will subsequently
a.always remain parallel.
b.always converge.
c.always diverge.
d.either converge or diverge, depending on the curvature of space.
3.If the universe is closed, then parallel lines
a.will remain parallel no matter how far they extend.
b.will diverge away from each other as they extend into space.
c.will eventually come together and intersect as they extend into space.
d.are undefined.
Solution
1. Option b is correct (the photons have been traveling through expanding space for a longer
time.)
2. Option c is correct. (always diverge.)
3. Option C is correct (will eventually come together and intersect as they extend into space.)
