If there is life on other planets, an Australian team of astronomers has just found the region in our Milky Way galaxy where it is most likely to exist.. Unfortunately, technology does not yet exist to get man within reach of his nearest possible neighbours. According to Charles Lineweaver, writing in Science, there are four ingredients needed to create complex life: the presence of a host star (such as the Sun), enough heavy elements (carbon, oxygen and nitrogen) to form a planet, sufficient time for biological evolution (at least four billion years in the case of Earth) and the absence...
