Neptune is the eighth planet of the solar system. ✬

The house is heated by solar energy. ✬

The ancient Greeks knew as much about the solar system as we do. ✬

Let's talk about solar energy. ✬

Solar energy is a new source of energy. ✬

The problem is that solar energy costs too much. ✬

The problem is that solar energy is too expensive. ✬

Jupiter is the largest planet in the Solar System. ✬

I want a car that runs on solar power. ✬

I wish I had solar-powered car. ✬