The First Rainbow Seen on Another Planet2014 03 14By Red Ice Creations
In a colourful first, astronomers have captured the image of a rare type of rainbow, or ’glory’, on another planet.
Rainbows appear on Earth due to light refracting off water droplets. In the case of this rainbow on Venus, light is refracting off a previously observed haze that is thought to be sulfuric acid!
Wojciech Markiewicz of the Max Planck Institute for Solar System Research in Gottingen, Germanytold New Scientist, "A full glory has never been seen before outside of the terrestrial environment."
Scientists think glories occur when sunlight bounces about inside the droplets and ends up leaving in the same direction it came from, making a ring of light that can only be seen if you’re precisely between the sun and the centre of the glory. The particles must also be nearly spherical and almost all the same size.
Read more at: newscientist.com