Hawking likes to make a sensational claim every now and again if nothing else just to say hey i'm still the man! i'm still here! i'm still the smartest 21st century cosmologist on this blue marble :D
Advanced life forms are improbable unlikely but should they win the lottery don't ASSUME they want to share the wealth
that's the import of Hawking's message :D
Hawking never said aliens landed on this planet. He didn't say they probably are immortal. He didn't say they even walk let alone travel interstellar distances.
(reign in your imagination :D )
He DID say they are probably primitive celled organisms like we were once.
your living in...
Hawking NEVER admitted any of the sort!
what if they have long life spans? what if they are geniuses? what if there really are little green men on mars that live under the ground? what if there is a god? what if? if? what if? if? if? what?
no evidence for any of it! :D
there is not any evidence of that.
i don't think you realize the PHYSICAL difficulty to interstellar travel. to sum it up..it is IMPOSSIBLE under known physics!
funny to watch a dog chase its tail round and round he goes into an infinite LOOP faster faster till he collapses into himself like a burnt out star :D
a big swinging dick is a hindrance to running take it from me a MAJOR track & field failure :D
http://www.reuters.com/article/idUSTRE63M3LF20100423?loomia_ow=t0:s0:a49:g43:r2:c0.190476:b33431116:z0