Can you see the Great Barrier Reef from space?
Yes, the Great Barrier Reef can be seen from space. Astronauts aboard the International Space Station have photographed it, and satellite images clearly show its reefs along the Queensland coast.
The reef is often described as the largest living structure on Earth, stretching more than 2,300 kilometres. Its shallow reefs and lagoons create patterns of turquoise and blue that stand out against the deeper ocean.
From low Earth orbit, around 400 kilometres up, astronauts can see large reef areas, especially on clear days. Satellites provide even more detailed images, which scientists use to study changes to the reef.
A common misconception
People sometimes say the reef is the only living thing visible from space. That is not quite accurate, as forests, crops and algal blooms can also be seen from orbit.
Similarly, the popular claim that the Great Wall of China is easily visible from space is a myth. The wall is long but very narrow and hard to spot with the naked eye from orbit.
Satellite monitoring is now an important tool for tracking coral bleaching, water quality and the effects of cyclones on the reef.