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chapter 17
chapter 17 cosmic perspective
9
Astronomy
Undergraduate 1
12/19/2013

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Term
What was the temp. in the early universe
Definition
the very early universe was so hot that energy could be transformed into matter and vice versa.
Term
planck era
Definition
don't know anything.
Term
what happened at the end of The GUT Era
Definition
energy was released that m have caused a dramatic expansion of the universe known as inflation
Term
The electroweak era
Definition
elementary particles appeared from energy but transformed back into energy
Term
The particle era
Definition
protons and antiprotons were made
Term
the era of nucleosynthesis
Definition
fusion produced helium from protons
Term
the era of nuclei
Definition
a plasma of free electrons H and He nuclei filed the universe
Term
the era of atoms and galaxies
Definition
atoms were formed and lasted until galaxies began to form.
Term
what is the cosmic microwave background
Definition
radiation left over from the big bang
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