Now, one expert is arguing that if we are truly alone, as seems to be the case considering little evidence has been discovered so far, then it does not bode well for humanity.
Bryan Walsh, author of the new book End Times which analyses the existential threats which humanity faces, believes “we should be worried” if we are alone.
Mr Walsh said in the book: “If we are truly as alone as we now appear, then perhaps intelligent life is an unlikely accident of cosmic fate, one in a 100 billion – the number of stars in the Milky Way.
“If so, our fate is even weightier, for Homo sapiens would become the cosmos’s sole conscious observers.
READ MORE: NASA chief says we will find proof of alien life in our lifetime