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so in the early universe things were really hot dense and
all the electrons and protons were separate and this is plasma and plasma is
totally opaque
so all the light that's around is just trapped it's like a cosmic pinball machine.
It's digging around against these electrons and protons. And then things cool as the
universe expands
and eventually the electrons and protons come together and they form
hydrogen.
and hydrogen gas is clear so
all that light that was trapped in this cosmic pinball machine is all of a
sudden free
and it just fills the universe and we still see it today.
So the places that were more dense are a little bit brighter
in places that were more diffused are a little bit dimmer. It's pretty cool, you can
test this idea you can actually go out and look for evidence at this
event eternal inflation. Although there's no direct
technological benefits to pure theoretical research perhaps
first you, never know. I mean I don't think Einstein was thinking about
the global positioning satellite system when he invented
theory of relativity. York is a great place to work the people in
my department are fantastic to discuss science with
it's just a really collegial great place to work. It's a big university so you
have
quite a big pool of students so the quality is good
to nice place to be.