An atom is the smallest building block of everything that exists. The smallest object you can see under a microscope has more than 10 billion atoms .
Electricity is the flow of electrical power or charge. Electricity is both a basic part of nature and one of the most widely used forms of energy
Our solar system is made up the sun, eight planets, more than 150 moons, as well as comets, asteroids, dwarf planets and other space rocks.