- Gravity is the phenomenon that attracts objects with mass or energy towards one another.
- It affects celestial bodies such as planets, stars, galaxies, and even light.
- The influence of gravity on smaller objects like human beings in the presence of larger ones, such as planets, is evident.
- Gravity, such as the Moon’s gravity, leads to ocean tides on Earth.
- Gravity accounts for the weight of physical objects. Its range is infinite, although its effects weaken as objects move farther apart
- Gravitational force is a universal force, meaning that it acts between all objects with mass, regardless of their composition or charge.
- Gravitational force is a long-range force, meaning that it can act between objects that are very far apart.
- Einstein’s theory of special relativity showed that mass and energy are equivalent, and can be converted into each other. This is expressed in the famous equation E = mc2, where E is energy, m is mass, and c is the speed of light.
- This means that any object with energy also has mass, and therefore can be attracted by gravity. For example, light has energy, and therefore has mass. This is why light can be bent by very large objects such as galaxies.