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By Science News
I was sorry to learn Pluto did not qualify as a planet (this article and “Doggone! Pluto gets a planetary demotion,” SN: 9/2/06, p. 149). Pluto has a diameter comparable with the Earth’s moon. The size of our moon relative to Earth might cause any observer to consider Earth and its moon as double planets. Pluto and Charon could have equal status.
Dennis Rich
Las Vegas, Nev.
Virgil H. Soule
Frederick, Md.
Charles Stewart
Coral Gables, Fla.
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Harry Pottol
Sunnyvale, Calif.