10233
The 2.7 " million " K photon temperature gives a typical photon energy of 250 " electronvolts , thereby setting a typical mass scale for warm dark matter : particles much more massive than this , such as GeV–TeV mass WIMPs , would become non-relativistic much earlier than one year after the Big Bang and thus have FSLs much smaller than a protogalaxy , making them cold .
 location: Big Bang
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Big Bang