Reply to post: Re: What's that work out to?

Voyager 1 passes another milestone: It's now 138AU from home

TechnicalBen Silver badge

Re: What's that work out to?

I'm not sure the "rate of expansion" effects that observation. Because the light is also travelling through the expansion as it moves, thus being red shifted accordingly etc. For example " Light that is emitted today from galaxies beyond the cosmological event horizon, about 5 gigaparsecs or 16 billion light-years, will never reach us, although we can still see the light that these galaxies emitted in the past"

It's hard to define objects we can only see the past of, and not even the present. Are they even "in our universe" anymore? Or have they ceased to exist? Thus leaving the "edge of the universe" still at the 14-16~billion light years?

Ah, found the details, it's about 46 light years across "now". https://phys.org/news/2015-10-big-universe.html

However I'd still argue that due to relativity etc we can say that it is now 14 billion across, and once the other light reaches us we could describe it as 46 light years across... at which point it would have expanded even more! ;)

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