17 Billion Hot Earths in Our Galaxy?

You might have seen- MSNBC News, Estimate suggests that our galaxy contains 17 billion sizzling-hot Earths, Jan 7, 2013; http://cosmiclog.nbcnews.com/_news/2013/01/07/16395770-estimate-suggests-that-our-galaxy-contains-17-billion-sizzling-hot-earths?lite

Subjects: Extrasolar Planets