... Hawking, the renowned theoretical physicist turned apocalypse warning system, is back with a revised deadline. In "Expedition New Earth" — a documentary that debuts this summer as part of the BBC’s "Tomorrow’s World" science season — Hawking claims that Mother Earth would greatly appreciate it if we could gather our belongings and get out — not in 1,000 years, but in the next century or so. You heard the man — a single human lifetime. Is this nerd serious? Thanks, Steve.