| Pluto Flunked the Planet Test, Again | A new test for defining the planetary status of an exoplanet has been formulated, but a certain dwarf planet in our solar system still doesn't make the grade. | | | |  | |  | Get your sci-tech headlines all day on Twitter too! | | | At Discovery Communications, we value your privacy. If you would like to be removed from future communications like this, please click here. Privacy Policy Discovery Communications, LLC One Discovery Place Silver Spring, MD 20910 © Copyright 2015 Discovery Communications, LLC | | | | |
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