Misconceptions About the Universe
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Over on youtube, Veritasium has a nice discussion of Misconceptions about the Universe. I like it, especially as I was the consultant cosmologist :) A little look down the comments tho, and we see several claims that what Derek says is not correct. Here's a little excerpt Well, as a cosmologist, I was surprised to read that the Hubble Sphere is an "outdated concept" having seen it used in a professional meeting last week. But let's take a look at the other claims that are made by "fullyawakened" - I must admit they have the lead on me as I am partiallyjetlagged at the moment. As ever, I am going to steal Tamara Davis's standard cosmological picture in a few different sets of coordinates to do this. I've explained these before, but the top one has distance as we know it along the x-axis, and time as we experience it up the y-axis. "Our observable Universe is getting smaller" is simply wrong. Let's look at the bottom fi