solar heating

Increasingly, as these industries develop, on-site solar and wind is a way of guaranteeing a lower price for electricity.

There is no reason to suppose that his is the only Solar System: there may be many millions of solar systems.

For aught we know, there may be millions of systems, each containing millions of solar systems.

Reckoning that Neptune is the outermost planet of the solar system, that system would have a diameter of 5,584 millions of miles.

I gathered that he thought something of the boy, and was heating up to the door-smashing stage.

The greatest part of the waste steam is condensed in heating the water to fill the boiler; what escapes is a mere nothing.