Tidal Forces











Explanation below (scroll down)

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The brightness of red dots round the surface of the blue planet and green moon changes to hint at the local pressure there, but the numbers on the left provide a more accurate guide - they show the net gravitational force at the surfaces of planet and moon on the points nearest and furthest from the other body, all measured in Newts (with 10 being the force on you if you're standing on the surface of a planet with the size and mass of the Earth in the absence of tidal forces). The initial setup provides a moon eight times more massive than ours and twice the size. It's orbit is also not like ours, although it starts at 250,000 miles out before swooping inwards.