Filters on the Liverpool Telescope
Credit: LT

Most cameras on telescopes today only measure the brightness of things. They are not able to measure colour at the same time.

GranTeCan Telescope

GranTeCan Telescope
Credit: GTC

The Gran Telescopio Canarias is also known as 'GranTeCan' or the 'GTC'. It sits 2,267 m up a mountain above the sea on La Palma. It is the largest telescope on the island. The GTC is owned by Spain, Mexico, and the University of Florida in the USA. It is looked after on the site by the local university, the IAC.

Ray Diagrams