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Astronomy

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  • $\begingroup$ you seem to be confusing mass, weight and density. Also you are not understanding the concept of 'center of mass' and how it is used as a superposition location point for calculations of forces. $\endgroup$
    – BradV
    Commented Jan 23, 2023 at 22:20
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    $\begingroup$ If all the mass of Earth was magically reduced to the size of a golf ball the location of its center of mass would remain at its absolute center, same as full size Earth (yeah, I know... Earth is not a perfect sphere but close enough for this discussion). So... the Earth to Sun distance would remain unchanged and gravitational force unchanged. $\endgroup$
    – BradV
    Commented Jan 23, 2023 at 22:27
  • $\begingroup$ Your question is a bit confusing. The gravity you experience on Earth is caused by the mass of the Earth, not by the Sun. Also, the radius of the Earth is tiny relative to the distance from the Earth to the Sun. $\endgroup$
    – PM 2Ring
    Commented Jan 23, 2023 at 23:52