Only one force - gravity.
Only one force - gravity.
Gravity.
Newton's laws of motion describe how objects move in response to external forces, while planetary motion refers to the motion of planets in space under the influence of gravitational forces. Newton's law of universal gravitation helps explain the motion of planets in their orbits around the sun by describing the gravitational attraction between celestial bodies.
3 laws' of planetary motion
According to Kepler's laws of planetary motion, planetary orbits are in the shape of an ellipse with the Sun at one of the foci.
Keplar figured out the laws of planetary motion using Tycho Brahe's data.
They all obey Kepler's 3 laws of planetary motion.
Gravity is the dominant force that governs motion in the universe on a large scale, such as the motion of planets, stars, and galaxies. It is responsible for keeping celestial bodies in their orbits. On a smaller scale, other forces like electromagnetism and nuclear forces also play a role in governing motion.
Johannes Kepler
His laws of planetary motion.
The mutual gravitational forces that attract a planet and the sun to each other are responsible for keeping the planet in orbit around the sun.
The length of a year is determined by the Earth's orbital motion around the Sun. Specifically, it takes approximately 365.25 days for the Earth to complete one full revolution around the Sun, which defines the length of a year. This orbital period is influenced by gravitational forces and the elliptical shape of Earth's orbit, as described by Kepler's laws of planetary motion.