The planck era refers to a time period in which all four forces are thought to have been unified. a very short period of extremely rapid expansion, called super expansion, is thought to have occurred when the universe was about 10-38 second old. the cosmic microwave background is our name for the photons we see that were first released when the universe was about 380,000 years old. the gut era refers to a time period in which the strong, weak, and electromagnetic forces were all unified. the big bang is the name we give to the moment when the expansion of the universe began. most of the helium in the universe formed during the era of nucleosynthesis. era of galaxies returned previous answersrequest answer incorrect; try again; 4 attempts remaining you filled in 2 of 6 blanks incorrectly. review the video; you will find all these terms clearly explained. part b which of the following represent observations or measurements that have confirmed key predictions of the big bang model? select all that apply. select all that apply. conditions during the electroweak era. the temperature of the universe during the gut era. characteristics of the cosmic microwave background. the abundance of uranium in the universe. the abundance of helium in the universe.