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19 August, 15:30

Which is heavier, the earth or the moon

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  1. 19 August, 15:56
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    When you say "heavy", you're talking about the gravitational force

    between that object and another object, so it depends on what the

    "other object" is.

    If the "other object" is, let's say, the sun, then the gravitational attraction

    between the Earth and sun is about 80 times as much as the gravitational

    attraction between the Moon and sun, because the Earth has about 80 times

    the mass of the Moon.

    But if, somehow, the weight you have in mind is the gravitational attraction

    between the Earth and the Moon, then those forces are equal. The force

    of gravity between two objects depends on the product of both masses,

    and it's equal in both directions.

    If that isn't clear to you, let me give you this additional fact that's guaranteed

    to knock you even further off-balance:

    Your weight on the Earth is determined by the product of

    (your mass) times (the Earth's mass).

    The Earth's weight on you is determined by the product of

    (your mass) times (the Earth's mass).

    Your weight on Earth is the same as the Earth's weight on you.

    Would you like to prove it?

    - - Turn the bathroom scale upside-down, so that the step-pad

    is on the floor.

    - - Then step on it, so that you're standing on the bottom, which

    is facing up.

    - - If you placed a little mirror on the floor, so that you can read

    the numbers, which are facing down toward the floor, you'll

    read your own weight, even though with the scale upside-down,

    you're weighing the Earth on you.
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