nsTeam2RO, nsTeam2RW, nsTeam2_talkRO, nsTeam2_talkRW
13,254
edits
Changes
→Starlight Problem for the Big Bang Theory: Mention proposed solutions to the Horizon Problem
The Big Bang model proposes that the temperature of the [[Cosmic Microwave Background]] (CMB) would have varied considerably from place to place early in the universe, yet because the speed at which this radiation can disperse from hotter to colder parts of the universe is limited by the speed of light, there has not been enough time for the radiation to even out, yet observations today show it to be extremely uniform<ref name="Lisle">Lisle, 2003</ref> (with fluctuations at the part-per-million level<ref>[http://map.gsfc.nasa.gov/m_uni/uni_101Flucts.html Fluctuations in the Cosmic Microwave Background]</ref>).
The Big Bang model proposes that the temperature of the [[Cosmic Microwave Background]] (CMB) would have varied considerably from place to place early in the universe, yet because the speed at which this radiation can disperse from hotter to colder parts of the universe is limited by the speed of light, there has not been enough time for the radiation to even out, yet observations today show it to be extremely uniform<ref name="Lisle">Lisle, 2003</ref> (with fluctuations at the part-per-million level<ref>[http://map.gsfc.nasa.gov/m_uni/uni_101Flucts.html Fluctuations in the Cosmic Microwave Background]</ref>).
{{QuoteBox|The problem is this: even assuming the big bang timescale, there has not been enough time for light to travel between widely separated regions of space. So, how can the different regions of the current CMB have such precisely uniform temperatures if they have never communicated with each other? This is a light-travel–time problem.<ref name="Lisle" />}}
{{QuoteBox|The problem is this: even assuming the big bang timescale, there has not been enough time for light to travel between widely separated regions of space. So, how can the different regions of the current CMB have such precisely uniform temperatures if they have never communicated with each other? This is a light-travel–time problem.<ref name="Lisle" />}}
A number of solutions to this problem have been proposed, including several versions of an "inflationary model", in which space itself expanded faster than the speed of light early in the Big Bang, but ''after'' different areas exchanged radiation to even out the temperature.
However, there is no consensus on which explanation is correct, and each of the proposed solutions have their own problems.<ref name="Lisle" />
== Bibliography ==
== Bibliography ==