Aliens may not exist after all:
PTI / London November 05, 2012, 13:25 UFO enthusiasts in the UK have admitted that aliens may not exist after all, citing the declining number of 'flying saucer' sightings and lack of ``compelling evidence'' to prove the existence of extraterrestrial life.
One of the world's leading physicists, Stephen Hawking says aliens do exist but humans should stay away from them.