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Physics, Astronomy & Cosmology / What causes a planet's gravity?
« on: 23/09/2008 18:28:46 »
Is there a certain material in the center of a planet that causes it? maybe a megnetic material? has there been a study on it?
Thank you.
(please explain easily first and then scientifically)
Thank you.
(please explain easily first and then scientifically)