We should increase the use of alternative energy to protect the earth.

We should save electricity for energy conservation.

A solar day is the time it takes for the Earth to orbit around the Sun.

He was reading a book about the ancient Egyptian sun god.

The ocean currents can change due to the effect of the solar tide.

We installed solar batteries on the roof of our house.

The Solar System is composed of eight planets, including Earth.

Solar wind affects the Earth's magnetic field.

Kinetic energy is directly related to the speed of an object.

The use of renewable energy helps protect the global environment.