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.
Las Vegas, Nev.
Virgil H. Soule
Coral Gables, Fla.
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