How is the size of the observable universe is calculated?

Question

Levi Anderson · Accepted Answer

Oldest stars were there 13.8 billion (B) years ago, 13.8 B ly away, Beyond this it is arithmetic only. This space had expanded to about 46 Bly. Add yet-to-observe mirror image for 46 Bly. .Total: 92.

This estimate is not mine; it comes from an unidentified source without any sort of verification. If the inquiry had concerned the size of the universe, I would have replied, "I don't know," going into my agnostic shell. Many questions are still awaiting a conclusive response. Is the universe a sphere that is infinite or finite, or is it finite? Is it Dark Matter, Dark Matter plus something else, matter in between galaxies, clusters, super clusters, and so forth that holds star systems together in a galaxy?

Elena Antonova · Answer

undefined The current estimate for the size of the observable universe is about 93 billion light-years in diameter. It is computed by measuring the rate of expansion of the universe and then extrapolating backward in time to determine its age. This is done using various astronomical observations, such as the cosmic microwave background radiation and the redshift of distant galaxies.