I will give brainliest to whoever answers first

The dashed segment of the plotted experiment in the graph in the lesson is called an

The graph below plots the temperature and luminosity of stars on the main sequence.

Ascientist is explaining how background cosmic radiation gives evidence of the big bang theory. she says that radiation has been detected everywhere equally as heat in the universe and is increasing. this has been shown to be residual radiation from the big bang. what error did the scientist make?