And Then There Were Eight: What's Behind the Vote ; 2003 Discovery Sealed Pluto's Fate

Summary


LOS ANGELES Astronomers rejiggered the nine-planet solar system for the first time in 76 years on Thursday, kicking out Pluto and creating a new category of "dwarf planets." Here are some questions and answers about our new solar system:

Q: Why is Pluto no longer a planet?

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And Then There Were Eight: What's Behind the Vote ; 2003 Discovery Sealed Pluto's Fate

Pluto lost its planet status because it is not the dominant object in its region of space, under new guidelines en...

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