Why some rainbows are all red
Sun’s spot in the sky influences how light bends to form colorful arcs
![rainbow](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/12/121715_ts_rainbow_free.jpg?fit=860%2C460&ssl=1)
ON THE SPECTRUM Rainbows containing only a limited fraction of the light spectrum form as the sun drops lower in the sky, new research finds.
Graham Hickey/Flickr (CC BY-SA 2.0)