I recently came across this site http://www.planethunters.org. It shows brightness observed for a star vs time. It asks questions like if star is exhibiting variable or fixed pattern. Later it asks if there are any transits which can indicate presence of planet.
While I find this interesting, it made me wonder why can't a computer program detect these patterns. Is this really hard? Given the fact this field has been subject of research for past so much time. These days we have programs can detect face, read text on live phone camera and translate it. So what's stopping this?
P.S. Also how can I ask same question across multiple stackexchange site? Maybe this is more SO / Physics question.