The Earth will not crash into the Sun because of its orbital mechanics. The Earth orbits the Sun in an elliptical path, and its orbital velocity keeps it from falling into the Sun.

The Earth's orbital velocity is about 30 kilometers per second. This means that the Earth is traveling at a speed of 30 kilometers per second in the direction of its orbit. This velocity is just enough to keep the Earth from falling into the Sun.

If the Earth's orbital velocity were to decrease, the Earth would begin to fall into the Sun. However, the Earth's orbital velocity is constantly being kept in check by the Sun's gravity. The Sun's gravity pulls the Earth towards it, but the Earth's orbital velocity prevents it from falling in.

The Earth's orbital mechanics are a complex system, but they work together to keep the Earth in a stable orbit around the Sun. This stability is essential for life on Earth, as it allows the Earth to maintain a relatively constant temperature and climate.