Timeline for Why is the observable universe so big?
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4 events
| when toggle format | what | by | license | comment | |
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| Dec 1, 2017 at 21:15 | comment | added | Keith Knauber | Ben, can you expand on your math above? How do we get from 13.7 to 80? Diameter = 13.7 radius * 2 = 27.4 27.4 * 3.3 = 90.42 90.42 is quite a lot more than 80. This is in line with the wikipedia estimate of 90.68 here en.wikipedia.org/wiki/… | |
| Dec 12, 2016 at 19:05 | comment | added | Lucy Meadow | What that means is that the physically observable universe is 13.7 bly's but that a real size of 80 bly's is inferable from theory. That is not the same as a direct measurement. The observable universe is therefore 13.7 blys | |
| Dec 12, 2016 at 19:04 | comment | added | Lucy Meadow | Ben, the sticking point (just personally for me) is referring to an observable universe. Observable means the physical packet of visual information in a quanta of incoming light contains two displacement values, one being the displacement at emission and the other being the displacement at absorption inclusive of the expansion of space during transit. Leaving the cosmological redishift to one side, that is clearly not the case. | |
| May 23, 2013 at 0:21 | history | answered | user4552 | CC BY-SA 3.0 |