Astronauts reveal mysterious purple ring
Astronauts from NASA have captured a mysterious ring around Tehran.
The breath-taking photographs were taken from the International Space Station and posted online by NASA astronaut Thomas Marshburn, Canadian astronaut Chris Hatfield and their space colleagues.
According to The Daily Mail in London, the images show a peculiar purple ring around the Iranian capital.
Other pictures reveal volcanoes, deserts, Caribbean islands and Northern Lights, among other incredible sights.
