Kepler space telescope - the search for another earth

I find this inspiring. If there are other earth-like planets out there the Kepler space telescope will be able to find them. Based on the type of star and orbit scientists can determine if the planet exists in what is called a habital zone - and likely to be an earth-like planet. Kepler will watch a cluster of around 100,000 stars for a period of 3.5 years to generate some statistically significant distributions.

from the article:

Boss said one day "we'll be able to stand outside ... and say 'Hey kids, look out there see that star? That one has an Earth".

What will you think if many are discovered? what if none are discovered?

I initially thought the satellite would have ability to detect analyze light for the presence of oxygen or other earth-like signature, but apparently that is not the case. The planets discovered are just good candidates. Here are Kepler FAQs.