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I'm not sure why this comes as a surprise to some. It takes a certain type of star, and a planet that is just the right distance from that star for life to be possible. Look at our own solar system, out of 9 planets we have two near misses (Mars, Venus) and one bullseye. That's 3 possibles or near possibles for our one star, the sun. The number of stars in the galaxy are near uncountable, out of all that it would actually be UNlikely that there aren't other suns with planets that are in the "life zone" orbiting around them.
I wouldn't be surprised if there were millions of such planets strewn around the galaxy. Then of course there are billions of other galaxies with trillions more stars and planets. To think we're the only life in the universe in light of all that is pretty presumptuous of some people.
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