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"The origin of the earth," geology schoolwork by Eve Drewelowe, March 1, 1922

Page 10

planetesimals. The spiral nebula is luminous and rotating and it may or may not be hot.
The spiral nebula originated with the partial disruption of a star. A star is an independent body in space - it has independent motion. Stars are disrupted by close approach rather than by actual collision for there are ten of the former to one of the latter. The earth and moon are held together by the force of gravity, and are held apart through centrifugal force, or a pulling away from the center, as opposed to a pulling toward the center of gravity. AT the center of the earth the forces are balanced. The centrifugal force is constant at all places but the force of gravity is not. There is more of gravity at the equator close to the moon than there is on the opposite side of the world, therefore there is a bulge away from the moon on the opposite side and we have high tide there. As the earth rotates we have alternating high and low tides, two low and two high each day. The closeness of approach of two stars when there is a rotating about their common center - Roch's limit - sets up a tidal strain, which may partially disrupt one of the bodies on the two opposite sides, which causes the spiral nebula. The material disrupted is shot out at different momentum and the rotation and motion of the other body cause the arms to be spiral, because of the pull of gravity in that direction. Some of the material thrown out escapes, some is pulled back and much will neither escape nor return but will be suspended between the two extremes. The center of the nebula is the center mass of the star which is rotating. The concentrations or planets revolve about the central mass or sun.
The solar system developed from this nebula.

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planetesimals. The spiral nebula is luminous and rotating and it may or may not be hot. The spiral nebula originated with the partial disruption of a star. A star is an independent body in space - it has independent motion. Stars are disrupted by close approach rather than by actual collision for there are ten of the former to one of the latter. The earth and moon are held together by the force of gravity, and are held apart through centrifugal force, or a pulling away from the center, as opposed to a pulling toward the center of gravity. AT the center of the earth the forces are balanced. The centrifugal force is constant at all places but the force of gravity is not. There is more of gravity at the equator close to the moon than there is on the opposite side of the world, therefore there is a bulge away from the moon on the opposite side and we have high tide there. As the earth rotates we have alternating high and low tides, two low and two high each day. The closeness of approach of two stars when there is a rotating about their common center - Roch's limit - sets up a tidal strain, which may partially disrupt one of the bodies on the two opposite sides, which causes the spiral nebula. The material disrupted is shot out at different momentum and the rotation and motion of the other body cause the arms to be spiral, because of the pull of gravity in that direction. Some of the material thrown out escapes, some is pulled back and much will neither escape nor return but will be suspended between the two extremes. The center of the nebula is the center mass of the star which is rotating. The concentrations or planets revolve about the central mass or sun. The solar system developed from this nebula.