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.

galaxies formed

antielectrons (positrons) as common as electrons

photons of cosmic microwave background released

temperature fell to 10^15 K

strong force and electroweak force first became distinct

carbon nuclei formed by fusion

inflation occurred

stars formed