images

The Great Barrier Reef in Australia from space

by

Nasa/Novapix

Reference

t-ocaus-00012

Date

2009-04-04

The Great Barrier Reef arches over 2000 kilometers along the northeast coast of Australia. The white calcium carbonate that coats the coral reflects light, making the water above the reef appear bright blue from space. Image taken from the International space station (ISS) on november 22, 2007.