whenever i like = where ever i like:
it's over there *points*
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artifus is doing it all wrong, Wed 27 Jun 2018, 17:29,
Reply)
Everything is expanding
Everything is going away from you, because spacetime itself is expanding. The further away stuff is,the faster it is expanding. We can observe that.
Now imagine something so far away that it is expanding at the speed of light. The distance to that point is exactly the same, in every direction - a sphere centred on you.
However, that's not the observable universe, because you can see some things that are outside of that area. If something just outside that sphere emits light, then that light is getting farther and farther away from you, but, your sphere is expanding over time, faster than light. At some point, the light will enter your observable sphere, so you can observe things beyond that boundary.
The observable universe is all the stuff that is within the area that light can travel in the roughly 14 billion years that the universe has existed.
It's roughly 100 billion light-years in diameter. You're in the middle.
(, Wed 27 Jun 2018, 18:16, Reply)
...
www.youtube.com/watch?v=buqtdpuZxvk
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artifus is doing it all wrong, Wed 27 Jun 2018, 18:21,
Reply)
Why is your sphere expanding faster than light? It's very definition is pinned to exactly the speed of light.
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evil_andy Stick stick stick stick sticky sticky stick stick, Wed 27 Jun 2018, 20:33,
Reply)
The universe can expand faster than c because it’s not actually moving.
Here’s a link to a Lawrence Krauss lecture that covers what we think we know about how the universe started, what happened next and how it’s likely to end*.
*Spoilers* We’re all fucked.
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jonbob loves you, Wed 27 Jun 2018, 21:10,
Reply)
It's not stuff that's expanding, it's spacetime
The speed that things are moving away from you is proportional to distance, as spacetime expands. It can, and does, get faster than light as you get a long way away.
Veritasium can explain it.
(, Wed 27 Jun 2018, 21:28, Reply)
I'm going to have to follow this up when I've had less beers. Which won't be tomorrow.
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evil_andy Stick stick stick stick sticky sticky stick stick, Wed 27 Jun 2018, 21:45,
Reply)
i look forward to fridays hangover
is a phrase i had not imagined myself making before this post
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artifus is doing it all wrong, Wed 27 Jun 2018, 23:18,
Reply)
Haha
Me too. His check shirt made me scared for a start.
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antmulder Flick your icefloss, Thu 28 Jun 2018, 0:05,
Reply)
I think that video will explain, but ask if not
V is pretty good, despite the shirts. He posted a brief life-story a few days ago, which I found quite interesting. About how he got into his YouTubery.
https://youtu.be/S1tFT4smd6E
(, Thu 28 Jun 2018, 1:08, Reply)
