Timeline for What was the density of the universe when it was only the size of our solar system?
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| when toggle format | what | by | license | comment | |
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| Sep 24, 2014 at 7:31 | comment | added | Luaan | The background radiation has a "temperature" of 2.73 K because of the expansion. As the space expands, so does the wavelength of the photons travelling in it - they are "red-shifted". When the "primordial photons" were still young, they were incredibly "hot" - they just lost most of that already. | |
| Jul 15, 2014 at 7:22 | history | answered | Carl Johan Soderquist | CC BY-SA 3.0 |