Research the size of the visible universe. It was recently published along with

Question

Research the size of the visible universe. It was recently published along with its accuracy. How does the size relate to the age of the universe (assuming the universe is not infinite in duration)? What technique(s) was used to estimate the size of the visible universe? How was that technique(s) calibrated? Try and follow the hierarchy of distance measurement techniques and describe how each depends on calibration by more accurate, shorter distance technique.

(For example laser ranging depends on our ability to measure the speed of light and time precisely, i.e. time x speed = distance, triangulation depends on our ability to measure the size of the baseline, e.g. an Astronomical Unit, and our ability to measure angular displacement)

Why do we refer to the visible universe rather than just the universe?

Explanation / Answer

1) size of the visible universe is limited by the speed of light and the age of the universe. Since the universe is 13.7 billion years old, the size of the visible universe is a bubble 13.7 billion light years in radius. 2) Hubble's Law calculations 3) red shift measurements from as many galaxies as possible 4) This is a lot of questions to ask in a single cramster post, and I'm not going to get too in-depth here. I know parallax is used for objects within about 100 light years. I know type 1a supernovae are all of uniform brightness, no matter where they explode, so they are used to calculate distance of faraway galaxies, since brightness diminishes as the square of the distance. 5) we refer to the visible universe because it is what is visible to us given the length of time elapsed since the Big Bang. There is space beyond the visible universe, but the light from those areas has not yet reached us, since we are limited by the speed of light and the length of time that light has had to travel.

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