All of you have given good explanations.

The video below also added more aspects, for example where the Earth's angular momentum comes from, why all planets move in the same direction, and how the solar system was formed in the first place.

Here I just want to mention another fact: The Earth, indeed, is getting farther away from the sun, and the change in distance may be affecting our planet's climate.

According to Live Science, the average distance between the Earth and the Sun is not static year over year. The Earth is getting farther from the sun.

Calculations from NASA show that the Earth is about 93 million miles (150 million kilometers) from the Sun on average.

But the Earth’s orbit is not perfectly circular, but or oval-shaped.

This means the distance between the Earth and the Sun ranges from 91.4 million to 94.5 million miles (or 147.1 million to 152.1 million km).

However, the universe has been found expanding. And the distance between the Earth and the Sun is also expanding slowly over time.

So what forces are acting on our planet or the Sun to make this happen?

There are two major causes. First, the Sun is losing mass. And the second is the force of tides on Earth.

The nuclear fusion reactions that power the Sun convert mass to energy. Because the Sun is constantly producing energy, it's steadily losing mass.

About another 5 billion years, the Sun would lose about 0.1% of its total mass before it begins to die. Although 0.1% may not sound like a lot, it's about the same amount of mass as Jupiter, or about 318 times Earth's mass.

Because the Sun is losing mass, its pull on Earth is weakening, leading the distance between them to drift away by about 2.36 inches (6 centimeters) per year.

Meanwhile, the moon's gravitational pull results in tides on Earth, so does Earth's gravity tug on the Sun. This stretches the side of the Sun that faces Earth, resulting in a tidal bulge.

But these tidal forces have a very weak effect on Earth's orbit. They cause the Earth to move about 0.0001 inch (0.0003 cm) away from the Sun every year.