Winner of the Earth and Space category and overall Winner of the Astronomy Photographer of the Year, 2014 — a glorious aurora photo by James Woodend. You can read more about it on the Greenwich Observatory’s page, and look at many more gorgeous photos while you’re at it.
For me, it’s the arc of light and its reflection that make this photo. There are a zillion beautiful aurora photos out there, but the symmetry in this one stands out.
(Click the image to borealize.)