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Full Idea
Special Relativity says nothing can travel 'through space' faster than the speed of light. But space itself can do whatever the heck it wants, at least in general relativity. And it can carry distant objects apart from one another at superluminal speeds
Gist of Idea
Space itself can expand (and separate its contents) at faster than light speeds
Source
Lawrence M. Krauss (A Universe from Nothing [2012], 06)
Book Ref
Krauss,Lawrence M.: 'A Universe from Nothing' [Simon and Schuster 2012], p.96
A Reaction
Another of my misunderstandings corrected. I assumed that the event horizon (limit of observability) was defined by the stuff retreating at (max) light speed. But beyond that it retreats even faster! What about the photons in space?
| 21105 | In 1676 it was discovered that water is teeming with life [Krauss] |
| 21104 | General Relativity: the density of energy and matter determines curvature and gravity [Krauss] |
| 21107 | Uncertainty says that energy can be very high over very short time periods [Krauss] |
| 21106 | Most of the mass of a proton is the energy in virtual particles (rather than the quarks) [Krauss] |
| 21108 | The universe is precisely 13.72 billion years old [Krauss] |
| 21109 | Space itself can expand (and separate its contents) at faster than light speeds [Krauss] |
| 21110 | An understanding of the most basic physics should explain all of the subject's mysteries [Krauss] |
| 21111 | It seems likely that cosmic inflation is eternal, and this would make a multiverse inevitable [Krauss] |
| 21112 | Empty space contains a continual flux of brief virtual particles [Krauss] |