8 ms·
So essentially one giant blob of cosmic background radiation was at the time its light was emitted, the size of an atom or so?
by drorco 3y ago
So essentially one giant blob of cosmic background radiation was at the time its light was emitted, the size of an atom or so?
- ben_w 3y agoKinda but different scale, the CMB era universe was about 1100 times smaller than that now, so still huge. There may be a neutrino background behind the CMB, where the universe was even smaller, and the gravitational wave background behind that with even more of a size difference.
- bozhark 3y agoPlays right into the white hole theory, interesting
- bloopernova 3y agoAs in a white hole is the big bang? That has a kind of poetic symmetry to it, with black holes (big crunches?) being the end, and white holes being the beginning of our particular universe. But our universe has black holes in it. Forgive the layman thinking, but does that mean we're just one of an infinite series of "nested" universes?
- pelorat 3y agoThe energy in our universe is not unlimited, so perhaps each black hole spawns a new universe, and each has less and less energy in it. Think about, WHY is there a certain amount of energy in the universe? Why not more or less. Maybe it's just universes all the way down.
- bloopernova 3y agoWould the universe in those other 2 older events have been 2 orders of magnitude smaller still? Have there been any estimates made for the sizes in each "event"? Are there even more events further back, or is the next one after gravity the big bang? What a fascinating subject, thank you for expanding my own little universe!
- ben_w 3y agoI'm skim-reading on mobile right now, so here's some more information, but I didn't see anything about how much the universe expanded since 1 second after the big bang, which is the relevant number for the neutrino background: https://en.wikipedia.org/wiki/Cosmic_neutrino_background https://en.wikipedia.org/wiki/Cosmic_neutrino_background https://en.wikipedia.org/wiki/Neutrino_decoupling https://en.wikipedia.org/wiki/Neutrino_decoupling and for gravity: https://en.wikipedia.org/wiki/Gravitational_wave_background https://en.wikipedia.org/wiki/Gravitational_wave_background
- devoutsalsa 3y agoThe cosmic microwave background radiation didn’t appear until the universe was about 380,000 years old. https://en.m.wikipedia.org/wiki/Cosmic_microwave_background https://en.m.wikipedia.org/wiki/Cosmic_microwave_background
- oneshtein 3y agoSo CMB is just 14B years old? Then why we see objects older than CMB? Moreover, why these older than CMB objects appearing in front of CMB?
- jvanderbot 3y agoWe dont see galaxies older than CMB.
- oneshtein 3y agoYep. This is the problem. Why CMB is emitted at the edge of our Universe only? Where are atoms, which produced the CMB?
- bigbillheck 3y ago> Why CMB is emitted at the edge of our Universe only? I thought CMB was emitted everywhere.
- oneshtein 3y agoCMB is produced by atoms, right? We see darker/lighter regions in CMB, so we should see a transition somewhere. 300M years is very short period of time, unless everything cooled very very uniformly, which is not the case. Sometimes, somewhere there must be a galaxy past CMB.
- bigbillheck 3y ago> a transition somewhere A transition from what to what? > which is not the case. Why not? > Sometimes, somewhere there must be a galaxy past CMB. If there is we'd have to wait for the light from it to get to us, by which time the CMB will have receded further and it would then be in front of the CMB.