Question

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 these events to the appropriate time period.(A) galaxies formed(B) antielectrons (positrons) as common as electrons(C) photons of cosmic microwave background released(D) temperature fell to 10^15 K(E) strong force and electroweak force first became distinct(F) carbon nuclei formed by fusion(G) inflation occurred(H) star formed(1) Sometime after the first five minutes(2) Within the first five minutes

Answer 1

(A) galaxies formed Sometime after the first five minutes

(B) antielectrons (positrons) as common as electrons Within the first five minutes

(C) photons of cosmic microwave background released Sometime after the first five minutes

(D) temperature fell to 10^15 K(E) strong force and electroweak force first became distinct Within the first five minutes

(F) carbon nuclei formed by fusion Sometime after the first five minutes

(G) inflation occurred Within the first five minutes

(H) star formed Sometime after the first five minutes