Astronomy is the study of everything in the universe beyond Earth's atmosphere. That includes objects we can see with our naked eyes, like the Sun , the Moon , the planets, and the stars . It also includes objects we can only see with telescopes or other instruments, like faraway galaxies and tiny particles.

Practical Physics is a collection of experiments that demonstrate a wide range of physical concepts and processes. These resources are for the use of teachers of physics in schools and colleges. Some of the experiments can be used as starting-points for investigations or for enhancement activities.