Reasons why Earth revolves around the Sun:
- Gravitational force:
The primary reason why Earth revolves around the Sun is due to the gravitational force between the two celestial bodies. According to Newton's law of universal gravitation, every object in the universe attracts every other object with a force directly proportional to their masses and inversely proportional to the square of the distance between them.
- Initial velocity:
When the solar system was formed, the gravitational pull of the Sun caused the gas and dust in the protoplanetary disk to collapse and form planets. The initial velocity of Earth's orbit around the Sun was determined by this gravitational collapse.
- Centripetal force:
Earth's movement around the Sun is a result of the centripetal force acting on it. This force is directed towards the center of the Sun and is necessary to keep Earth in its elliptical orbit.
- Balance of forces:
The gravitational attraction between Earth and the Sun creates a delicate balance of forces. If Earth were to move too close to the Sun, the gravitational pull would increase, causing Earth to speed up and move away. If Earth were to move too far from the Sun, the gravitational pull would decrease, causing Earth to slow down and move closer.
- Conservation of angular momentum:
Earth's orbit around the Sun is also influenced by the conservation of angular momentum. As Earth revolves around the Sun, it maintains a relatively constant distance and speed due to this principle.
In conclusion, Earth revolves around the Sun due to a combination of gravitational force, initial velocity, centripetal force, balance of forces, and conservation of angular momentum. These factors work together to keep Earth in its orbit around the Sun.