There are many satellites that orbit our Earth. You may not realise, but there is at least one satellite passing over your house every day. These satellites continually view our planet, creating images from the light or heat that it gives out. From these, scientists can derive really useful measurements of the land, oceans and atmosphere that help us to forecast the weather, monitor our climate, and gain knowledge of the planet.
Except of course when it's cloudy...
Clouds obs...