Astronauts team up with scientists to save coral reefs

The world's coral reefs, beautiful as they are, are in trouble.

Over the past couple of years a lot of them have been turning white, which is not their usual colour. This is known as coral bleaching.

Now, a team of scientists from Florida, USA, and Nasa astronauts have joined forces to try and help.

Watch Ayshah's report to find out more.

Pictures courtesy of ARC Centre of excellence for coral reef studies