The Sun's gravity is the main force that keeps all the planets in our solar system in their orbits. The Sun's immense mass creates a strong gravitational pull that keeps the planets in orbit around it.
The Sun's gravity remains relatively constant over time. However, small changes in the Sun's mass can have an effect on the orbits of the planets. For example, during periods of high solar activity, the Sun's mass increases slightly due to the release of energy, which can cause minor changes in the orbits of the planets.
No, the Earth's orbit around the Sun is not a perfect circle. It is slightly elliptical, meaning that at certain points in its orbit, the Earth is closer to the Sun (perihelion) and at other points it is farther away (aphelion). This is due to the gravitational pull of other planets and objects in our solar system.
The Sun's changing orbit does not directly affect our climate. However, the Sun's position in relation to the Earth does have an impact on our climate. For example, when the Earth is closer to the Sun during perihelion, it receives slightly more solar radiation, which can lead to slightly warmer temperatures on Earth.
The Sun's changing orbit is a natural occurrence and has been happening for billions of years. It is not expected to have a significant impact on our planet in the future. However, changes in the Sun's activity and mass can have a small influence on our planet's orbit and climate over long periods of time.