wormartin asked: I have a question about that Big Bang post. According to it, Universe has a diameter, yet according to Neil deGrasse Tyson in the latest StarTalk Radio YouTube video, he says Universe has no center. How can something have a diameter and not have a center?
That’s a great question,
I think in the video’s presentation diameter is used as a description that we humans can visualize and understand. Neil, I believe, has described the expansion period as space being created/expanding everywhere all at once with no central point. I think this is actually the most common understanding.
That’s a hard thing to visualize and I think the video simplified it.
Although perhaps it may come down to WHEN Neil.D.T was referring to space expanding everywhere equally. Maybe not.
It’s weird that we can actually have a conversation about when everything came into existence. That doesn’t even make sense to me that we should be able to comprehend it.
I’ll check out the podcast though, sounds like a good one!