Title: How many planets in our universe could support life? | HowStuffWorks
Headings: How many planets in our universe could support life?
How many planets in our universe could support life?
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Kate Kershner     "How many planets in our universe could support life?" 22 September 2014. HowStuffWorks.com. <https://science.howstuffworks.com/planets--universe-support-life.htm>     29 May 2021
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