Even though there are only 8 official planets in the solar system, it can be tricky to remember them all in order from the Sun. A popular technique to use a mnemonic, which can be any sentence you wan. .
There is an ongoing debate about the number of planets in our solar system. The most recent definition of a planet was released in 2006 by the International Astronomic.
[pdf] A solar panel is a device that converts sunlight into electricity by using photovoltaic (PV) cells. PV cells are made of materials that produce excited electrons when exposed to light.
[pdf] 
