4 ms·
The radius of the universe is closer to 46 billion light-years: https://en.wikipedia.org/wiki/Observable_universe https://en.wikipedia.org/wiki/Observable_univ
by floxy 3y ago
The radius of the universe is closer to 46 billion light-years:
https://en.wikipedia.org/wiki/Observable_universe https://en.wikipedia.org/wiki/Observable_universe
- qup 3y agoThe photons have emanated in a sphere from point of origin with a radius of 13.5 billion light years. The radius of the universe is irrelevant.
- capitainenemo 3y agoWell, it's a good point no? If the universe is expanding as the photons propagate they are spread out into that larger sphere. So for the purposes of light gathering, a galaxy 13 billion years in the past has its photons spread over that much larger sphere into even greater invisibility. Although I guess in this case they were spread out into the larger sphere at the point of the expansion of the universe of a few billion years ago before being focused towards us - so. Some value significantly smaller than 46 but a lot larger than 10. Which makes it even more amazing to think about.
- oneshtein 3y agoDo you have an evidence that space and time can be stretched at all? Can you stretch it a bit for me?
- irrational 3y agoI just ate a bunch of food. I am now more massive. So I have stretched space around me a bit more than I did before I ate. You just need to make an instrument sensitive enough to detect it.