What does The Sun represent?

The sun symbolizes the insignificance and fragility of the human race. The sun appears in two instances within the novel. The first is when the woman at the meeting states that humans are at the mercy of the sun. Later, Jeffrey sees the sun's light match the lines of the city. This fills Jeffrey with wonder. If the sun become colder or hotter, humans would cease to exist. However, currently it allows us to exist. Jeffrey acknowledges this, yet is still fills him with wonder.