Scientists actually scanned some 220 odd planets before they came across a habitable one - Gliese 581 C. The temperature here can sustain life and permits the existence of liquid water. Other planets had what scientists call the "Goldilocks problem" (I love the term). Basically, it means that they were either too hot or too cold. Although, I still maintain that life may also exist in planets with extreme conditions. Just like some creatures are able to sustain the immense pressure and no sunlight conditions of the ocean depths.
As I had earlier commented in my blog on extra-terrestrial life, the law of probability ensured that a habitable planet should exist. If I may extrapolate audaciously, the chances are around 0.45% (1 in 220). That should give scientists a new hope. Now they just need to build a vehicle that can travel really really fast. Something like this. Alternatively, if the inhabitants of such habitable planets are helpful, we can ask them to pick us up.
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