Waves

This backgrounder explains what light is, how it is measured, and how it affects people on Earth and astronauts on board the International Space Station.

Try out this cool activity to hear sound vibrations.

Explore how we see things through water.

How is light connected to the colours we see? In this STEAM activity make a colourful light catcher and discover why we see different colours?

Explore the concept of persistence of vision in this hands on activity.

How does the human eye see visible light as colour? And why do some people see more colours than others?

The human eye lets us see the world by sending impulses to our nervous system. In many ways, it is very similar to other optical devices, including cameras.