Our planet isn’t a perfect sphere, as such Earth’s mass is distributed unevenly. Ponder how uneven mass manifests itself as uneven gravity.
Pictured above Hudson Bay, Canada, one of Earth’s gravitational anomalies.
Science has pondered lower gravity in Hudson Bay since the 1960s. Basic laws of gravity dictate its force is proportional to mass in a given region. One theory steps 20,000 years back to the last ice age, a time when behemoth ice sheets crinkled Earth’s crust, displacing mass. Another theory credits tectonic plates, movement of magma and subduction.
We think of gravity as constant, one planet, one equal gravitational force. I wonder how many know they weigh 1% less at the equator than the poles. Rotation creates centrifugal force which varies by latitude because our planet is a oblate sphere. Centrifugal is an outward force, gravity a inward phenomenon. Earth spins fastest at the equator, outward centrifugal forces cancel gravity resulting in diminished measurable weight. The link below is a great resource –
Newton’s Law of Universal Gravitation states that every particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
Uneven gravity isn’t fickle or complicated, uneven distribution of mass and centrifugal force account for gravitational anomalies. Everything happens for a reason.