Earthlings can now heave a sigh of relief, as contrary to popular belief, the earth is not heading towards doomsday and that the universe is younger than perceived, if the conclusions of US astronomers are to be believed.Top astronomers of the Hubble space telescope key project team have announced their conclusion that the birth of the Universe in a Big Bang explosion is dated between 12 adn 13.5 billion years ago, much more recent than thought.