''We are all time travellers, journeying together into the future. But let us work together to make that future a place we want to visit''Will we survive on Earth?Should we colonise space?Throughout his extraordinary career, Stephen Hawking expanded our understanding of the universe and unravelled some of its greatest mysteries. In Will We Survive on Earth? the world-famous cosmologist and bestselling author of A Brief History of Time turns his attention to one of the most urgent issues for humankind and explores our options for survival.''Effortlessly instructive, absorbing and witty'' GUARDIANBrief Answers, Big Questions: four new books celebrating the genius of Stephen Hawking''s brilliant No. 1 bestselling work, Brief Answers to the Big Questions, each offering two electrifying essays from one of the greatest minds of our age.