There? [ laughter ] are they studying us, and what do they think about new york city? [ laughter ] >> well, let me just say that in our own mickey way galaxy there are 100 billion stars. and we now believe in our universe we have more than 100 billion galaxies. if you do the math the chance that there's a planet like earth with life is very high. >> i just want you to speculate, do you think in what time frame might we expect to find some evidence of, say, microbial life elsewhere in the universe? >> i always like to start by saying scientists never like to speculate. we always like the facts....