Which of the following is NOT one of Pluto's moons?

6:53 AM, Feb 18, 2013   |    comments
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d. Orpheus

Pluto was discovered on Feb. 18, 1930.

Out of its five moons, only three of them have names.  The other two were only discovered in the past two years and go by the scientific designations of P4 and P5.  But they won't stay nameless for much longer.

An online contest is currently underway to choose two names to submit to the International Astronomical Union.  The contest runs through Feb. 25 and you can vote at www.plutorocks.com.

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