Astronomy Chapter 23 Sorting Task

Although we can divide the history of the universe into many distinct “eras,” sometimes it’s useful just to have a broad perspective on what events occurred in the very early universe and what events occurred later. Listed following are events that occurred either before or after the first five minutes in the history of the universe. Match there events to the appropriate time period.
Either Within the first five minutes or Sometime after the first five minutes
galaxies formed
Sometime after the first five minutes
antielectrons (positrons) as common as electrons
Within the first five minutes
photons of cosmic microwave background released
Sometime after the first five minutes
temperature fell to 10^15 K
Within the first five minutes
strong force and electroweak force first became distinct
Within the first five minutes
carbon nuclei formed by fusion
Sometime after the first five minutes
inflation occurred
Within the first five minutes
stars formed
Sometime after the first five minutes

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