Astrophysicists predict that recombination between electrons and protons occurred when the universe had cooled to about 3000 kelvin. To the nearest power of ten, by what factor has the universe's surface red-shifted since then?
W) 10^-3 (read: Ten to the power of negative three)
X) 10^-1 (read: Ten to the power of negative one)
Y) 10^1 (read: Ten to the power of one)
Z) 10^3 (read: Ten to the power of three)
✔️Answer:Z) 10^3 (read: Ten to the power of three)
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