Summary:
- The laws of gravity discovered by Sir Isaac Newton in the 17th century apply not just on Earth, but across the entire universe.
- Observations of distant galaxies and stars show that the same gravitational laws that govern the motion of planets in our solar system also govern the motion of objects throughout the cosmos.
- This consistency in the laws of gravity, from the smallest scales to the largest scales of the universe, is a testament to the fundamental nature of these physical laws and our understanding of the universe.