t = r^2/g × m1 × m2, the law of universal gravitation occurring within the earth
- For extremely large objects, the external force of gravity, or the Law of Gravitation of satellites, Planets, Stars, and Galaxies, has a reasonable value:
F = G × M1 × M2 /R^2
- But for extremely small objects, the internal force of gravity, or the Law of Universal Gravitation occurring within the Earth, has a reasonable value:
T = R^2/G × M1 × M2
For example, if two people with a mass of 70 kg are 200 km apart, what will the internal force of gravity be?
T = R^2/G × M1 × M2 = (200 × 10^3)^2 / 6.674 × 10^-11 × 70 × 70 = 122 × 10^15 N
(Two people who are far apart often experience a greater attraction than two people who are close together, which is why we often wish to have a significant other who lives far away).
=> Given the vast distance, it's natural that the insect world could become a Star, because the gravitational force between them is stronger than the gravitational force between the Earth and the Sun.
Therefore, we have F × T = 1
Where:
- F is the external gravitational force, similar to the law of gravity for satellites, planets, stars, galaxies, and the universe.
- T is the internal gravitational force, only applicable inside the Earth to all things.
- G is the gravitational constant, applicable both inside the Earth and in outer space, having the same value and being a constant, G = 6.674 × 10^-11 N × m^2/kg^2.