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it demands too great an effort for us to do so we are too familiar with the way things are to question the ideas we have proved that those ideas are correct we are so sure of ourselves that we never doubt anything on the earth
it is fixed if it is outside the earth’s gravitational pull it decreases four times when it is 4,000 miles from the earth’s center it varies with the change of the gravitational attraction between two objects things increase in amount as they are closer to the earth’s surface
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it is too small to have a gravitational pull of its own. its pull is so small that we tend to ignore it. its pull disappears in the presence of the earth's gravitation. it tends to melt and loses its gravitational pull.
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