What does this symbol indicate on a weather map?

The point where two air masses meet is called a

Based on what you know about the location of the earth in relation to the sun, why is this called the goldilocks zone in other galaxies?

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?