In Simple sentences.

1.Explain why the Earth orbits the Sun, but the moon orbits the Earth.

2.How does size impact gravitational force?

3.How do the Sun’s gravity and the Earth’s inertia keep us orbiting in the solar system?

1. The Earth orbits the Sun because of the force of gravity. Gravity is a force that pulls objects towards each other. In this case, the Sun's gravity pulls the Earth towards it, causing the Earth to continuously move in a circular path around the Sun. Similarly, the Moon orbits the Earth because of the Earth's gravity. The Earth's gravity pulls the Moon towards it, making the Moon move around the Earth in a circular path.

2. The size of an object impacts gravitational force because the larger an object is, the more gravitational force it generates. Gravitational force depends on the mass (amount of matter) of an object. So, if two objects have the same mass, the larger object will exert a stronger gravitational force. For example, the Sun has a much greater mass than the Earth, which is why it exerts a strong gravitational force on the Earth and keeps it in orbit.

3. The Sun's gravity and the Earth's inertia work together to keep us orbiting in the solar system. The Sun's gravity pulls the Earth towards it, trying to make the Earth fall into the Sun. However, the Earth's inertia comes into play. Inertia is the tendency of an object to resist changes in its motion. The Earth's inertia makes it keep moving forward in a straight line. As a result, the Earth continually falls towards the Sun but also keeps moving forward, causing it to stay in a nearly circular orbit around the Sun. The balance between the Sun's gravity and the Earth's inertia keeps us in orbit and prevents us from being pulled into the Sun.