1. Has to spin on its axis
2. Has to have liquid (not neccesarily H2O water)
3. Has to have a magnetic field to protect from radiation
4. Has to have geological features (Volcanoes, mountains, valleys ect.)
5 Has to have weather (Tornadoes,Hurricanes,earthquakes,seasons)
6. Has vegatation
7. Has some kind of internal plumbing
8. Size of planet is irrelavent.
Good criteria? Or did I exclude something from this list? And why or why not is this a good list to accurately know what a planet is?
2006-11-16
06:48:33
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3 answers
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asked by
Maurice H
6