The Big Dipper swings low over the Badlands of Dinosaur Provincial Park, with an aurora added for good measure.

This another shot from my very productive night last Sunday out at Dinosaur Park, 100 km east of me. Here the curtains of aurora that made the news that evening shimmer below the iconic seven stars of the Big Dipper, now low in the northern sky on autumn evenings.

Light from the Full Moon provides the illumination. People wonder how we astrophotographers can take pictures of the stars in the daytime. We don’t. We take them at night, letting the Moon light the scene. Its light is just reflected sunlight, so a long enough exposure (and in this case it was only 8 seconds) records the landscape looking as if it were daytime, complete with blue sky, but with stars – and this night an aurora – in the sky.

– Alan, October 2, 2012 / © 2012 Alan Dyer