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Message: <blockquote data-quote="jonesy" data-source="post: 5698048" data-attributes="member: 10324">I don't know what persnickety is, and I did think I knew what you meant, and I did think I answered it.We aren't seeing what the universe is like. We are deducing it. All information arrives to you on a time delay. Even looking at something next to your nose is on time delay. You could be looking at a lit lamp, only it isn't really lit at that exact moment because of a power failure, and then a fraction of a fraction later the information that the lamp isn't lit gets to you. It's much much moreso when you look out at the stars.Here's an example of what I mean: let's suppose that all of the stars suddenly went out, except Sol. You know how long it would take us to find out? We'd be all alone next to the only lit star in the universe and we wouldn't even know, because all of the information coming to us would be outstandingly outdated. As it is already.I said that we aren't seeing something 15 billion light years away, because the things that light is telling us are there aren't there. Not anymore. They've moved on. And it's not a one-way highway. It's going everywhere. And it's relative from where you are. And that is messing up the image that light is telling us. The universe has been fattening itself for so long it's made it very far indeed.But let's finally get down to what's really bugging you. Current data puts the age of the universe at ~13.75 billion years. Current data puts the edge of the observable universe at ~47 billion light-years away. Right now the universe is expanding at the speed of ~74 kilometers/second/megaparsec. That means that for every million parsecs of distance the rate of expansion increases ~74 kilometers per second from the observer. 1 parsec is 3.26 lightyears. 1 lightyear is 9,460,730,472,580.8 km. So, for every 30,856,780,000,000,000,000 km (a million megaparsecs) the expansion we see increases by 74km/s. If we are looking at light from a spot 13.75 billion lightyears away the rate of expansion is (421,576,859,283km x 74km)/s, from our point of view. If we did the calcuation there, it would be the same, from there.But that's only the observable universe.And if I messed the math at some point I blame the screwy way of different people writing billion a different way. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f61b.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":p" title="Stick out tongue    :p"  data-smilie="7"data-shortname=":p" /></blockquote>

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