Is there any definition by which a moon is considered to be a planet?
I was reading an article about Io's magma "ocean" and noticed that by the end they were referring to that moon as a planet.
Quote:
For now, Io remains a truly distinct planet. Dr. Khurana, comparing the surface of Io to a freshly baked pizza, noted that at 1/40 of Earth’s size, Io produces 40 to 100 times more lava each year than all of the volcanoes on Earth. And the research team’s discovery only adds to Io’s individuality.
“Io is the only planet that we know of in the solar system that has a magma ocean,” he said.
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The article is from FoxNews.com
http://www.foxnews.com/scitech/2011/...-moon-jupiter/
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