The title of "planet" seems to be as rock solid as the surface of Neptune these days. Pluto? Leave your membership card at the front desk. Ceres? Kicked out of the club over 150 years ago. As science ...
The solar system may have a ninth planet after all. This one is 5,000 times bigger than outcast Pluto and billions of miles farther away, say scientists who presented "good evidence" for a ...
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