Lyric discussion by Klieserber 

I agree with WhiteTide, about the sun being out and trying to kick start it. I'd say the 8.5 minutes was the time between the sun actually going out and the time before the last of it's light hit the earth. The last 8.5 minutes of life as you know it. The verses talk about the aftermath, and the chorus goes back to how people reacted during the event.

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