An Estimated 100 Billion Planets In The Milky Way Alone

It has been speculated that up to 300 Billion planets may exist in the Milky Way, but this article suggests 100 Billion.  Either way, that's a lot of planets:
http://theweek.com/article/index/272284/how-science-is-accelerating-our-search-for-alien-life

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