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The renowned astrophysicist said he fears mankind is in great danger and its future "must be in space" if it is to survive.

France has said that it will follow Britain's lead in imposing a bonus tax, while Greece has promised a 90% levy (Athens is not renowned as a global financial hub).

In a new Discovery Channel documentary to be aired in May, renowned astrophysicist Dr. Hawking suggests that with 100 billion galaxies in the universe it seems "perfectly rational" that aliens exist.