Blue Flash at Paranal (image) ESO Share Print E-Mail Caption ESO staff Guillaume Blanchard was able to capture the rather rare blue flash while observing the sunset on Christmas eve from the Paranal Residencia. The image was taken with a digital camera attached to a telescope with a 480-mm focal length. The very intense blue seen on the image, as well as the purple edges, do not leave any doubt on the reality of the phenomenon. Please remember that looking at the Sun, especially through an optical device (camera, telescope, binoculars, etc.), is very dangerous, and could cause immediate blindness. Do not attempt to observe the Sun unless you know what you are doing. Credit Image copyright Guillaume Blanchard (ESO). Usage Restrictions All images are copyright their authors and can only be reproduced with their permissions. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.