... Aurora in the Distance . ... 19.11.2007 . ... Credit: Lance McVay Explanation: Some auroras can only be seen with a camera. ... The reason is that the human eye only accumulates light for a fraction of a second at a time, while a camera shutter can be left open indefinitely. When photographing an already picturesque scene above Juneau , Alaska , USA , a camera caught green sub-visual aurora near the horizon. ... Publications with keywords: aurora . Publications with words: aurora . ...