Gravity is not exactly the same everywhere. While the fundamental gravitational constant (the strength of gravity as a universal force) is believed to be the same throughout the universe based on current scientific understanding, the gravitational acceleration experienced at a specific location varies due to local factors. On Earth, gravity varies slightly from place to place because the planet is not a perfect sphere, it is denser in some areas than others, and because of Earth's rotation. For example, gravity is weaker at the equator due to centrifugal force from rotation and the Earth's equatorial bulge. Gravity is slightly stronger at the poles and can vary with altitude, local terrain, and subsurface density. The acceleration due to gravity on Earth's surface ranges roughly from 9.76 m/s² to 9.83 m/s² depending on location.

In the broader universe, the gravitational constant used in Newton's law of universal gravitation is considered uniform everywhere, meaning that gravity as a fundamental force operates consistently throughout space. Observations and experiments, including studies of celestial systems like binary pulsars, have found no significant variation in this constant across different parts of the observable universe.

Summary:

• Gravity's fundamental constant is the same everywhere in the universe as far as current research shows.
• The gravitational pull or acceleration varies locally on Earth due to shape, rotation, altitude, and density variations.
• On Earth, gravity is stronger at the poles and weaker at the equator, with small variations caused by geography and altitude.

This explains how gravity can be both a universal constant and locally variable in strength.