How many more years we can live on this earth...World renowned Physicist Stephen Hawkings has warned that the human life on earth will be in trouble within the coming six hundred years if we continue to grow like this in number and consume
energy at this rate. He adds that if this human race has to continue we may have to find out another planet inhabitable for this race. So far the same has not been identified. So, he says that the scientists must concentrate on this and also invent small spacecraft with its speed equivalent to that of light rays. Scientists must concentrate on these types of research here after.