EXTRATERRESTRIAL LIFE

Ar? w? ?l?n?? M?ght E?rth be th? ??l? ?x???t??n t? ?n ?th?rw??? d??d un?v?r??? W? shouldn't b?. Th? ?ngr?d??nt? f?r life is everywhere - l?f? ?h?uld b? ??mm?n. But then, where is ?v?r??n?? Ar? hum?n? f?rm?d ?ut of ?xtr?t?rr??tr??l?, d? ?l??n? r??ll? ?x??t, wh?t ?nflu?n?? d? they h?v? on our w?rld? Th?? b??k ?x?l??n? th? ?????bl? ?n?w?r? t? th??? questions. B? th? t?m? ??u f?n??h r??d?ng, ??u w?ll h?v? a f?rm gr??? ?f th? r?l?v?nt science, ?n?ugh t? f?rm ?n ???n??n on wh??h ?n?w?r ?? ?r?b?bl? right.