For billions of years, the moon has been the Earth's visible companion - and source of intrigue. It is considered to be our planet's only natural satellite and widely accepted to have been created by "The Big Whack" - from debris left over after a huge impact between Earth and an asteroid. But what if the moon is not as natural as we believe and is actually man made? Researchers Christopher Knight and Alan Butler have spent years writing and compiling scientific theories that the moon may have been created by us or even aliens. They claim there are a...