28 | Roger Penrose on Spacetime, Consciousness, and the Universe
Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
The Schwarzschild Radius
John Wheeler was very worried about these things, and the worry came particularly to a head when Martin Schmidt concluded that this was the first quasar. The signals from this object were redshifted, so that meant probably it was receding from us at a very great speed. And thirdly, it had variations in its brightness of the order of a week or so, which suggested that it couldn't be much bigger than the solar system. So they thought this was an artifact, there's maybe some special thing, but it's not usually what you'd expect.
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