What would it have been like to walk the lava-filled earth four and a half billion years ago when it first existed? Did you know that before life existed on earth it could have come from the dusty surface of Mars? How would it feel to stand beside an erupting volcano? Or take your first step on the surface of the moon? And what would you do if robots took over the world? Prepare to unlock the secrets of the universe with Lucy and Stephen Hawking in this incredible collection of writing by scientists from all over the globe. Beautifully illustrated and absolutely bursting with incredible facts and figures, this is the perfect guide to everything you've ever wanted to know about our world and beyond. Where will you begin?