Continent in the Sky


Shining overhead on northern summer nights right now is the blue supergiant star Deneb, in Cygnus. Nearby glow the magenta clouds of the North America Nebula.

This image shot with a telephoto lens takes in roughly the same field of view as a pair of binoculars. But being a long time exposure it reveals much more of the faint nebula than even the aided eye can see. However, even binoculars will show a greyish cloud near Deneb in roughly the shape of North America. It is actually a continent of stars and hydrogen gas, glowing with hydrogen’s characteristic magenta colour, a mix of deep red and blue emission lines. The gas may be electrified into glowing by the searing radiation from the star Deneb, some 1400 light years away from Earth.

I shot this on a July night, with some haze passing by during some of the exposures. The haze added the photogenic glows around the stars.

— Alan, August 8, 2012 / © 2012 Alan Dyer