1. Gravity: The sun's immense mass exerts a strong gravitational pull on the planets, constantly trying to pull them inwards.
2. Inertia: Planets are constantly moving forward in a straight line due to their inertia, the tendency of an object to resist changes in its motion.
How they work together:
* Gravity pulls the planets towards the sun, constantly trying to make them fall in.
* Inertia wants to keep the planets moving in a straight line, pushing them away from the sun.
* The balance between these two forces creates an orbital path. Imagine a ball on a string being swung in a circle. The string acts like gravity, pulling the ball inwards, while the ball's momentum keeps it moving in a circle.
If a planet was moving too slowly, it would be pulled in by gravity and crash into the sun. If it was moving too fast, it would escape the sun's gravity and fly off into space. The planets' current orbital speeds are just right to maintain a stable orbit around the sun.
