A STAR primed to explode in a blast that could wipe out the Earth was revealed by astronomers yesterday.

It will self-destruct in an explosion called a supernova with the force of 20 billion billion billion megatons of TNT.
Read more:http://www.thesun.co.uk/sol/homepage/news/2795981/Supernova-may-wipe-out-the-Earth.html#ixzz0bvrDKKRP    Your keyword is "earth"