I think everyone either knows or hopes that we are not alone in the universe. Given the number of stars and planets there are in the universe and just the general immensity of space, there has to be!! Why is it so hard for us to find a planet that could harbor life just like Earth? This video very succinctly tells us why and what we're doing about it. Pretty cool!
http://www.ted.com/talks/jeremy_kasdin_the_flower_shaped_starshade_that_might_help_us_detect_earth_like_planets
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