Electromagnetic Spectrum


Light moving through fibre optic cables.
Credit: Mato Rachela

When we refer to light, we usually mean a very small part of the whole electromagnetic spectrum which we can see with the human eye. Sometimes this type of light is called visible, or optical, light.

Keck Telescope

The most powerful telescope on the summit on Mauna Kea is the twin Keck observatory, which has two 10 metre diameter mirrors. At the heart of each Keck Telescope is a revolutionary primary mirror made up of 36 hexagonal segments that effectively work as a single piece of reflective glass. By combining advanced optical and infrared detectors with sophisticated electronics that can combine collected light from both telescopes, the Keck observatory remains amongst the leading astronomical facilities in the world.

Greenhouse Effect Demonstration