Pinwheel Galaxy by Brian McGaffney
The Pinwheel Galaxy (Brian McGaffney)
The Pinwheel Galaxy by Brian McGaffney

Photo of the Week for July 18, 2014 The giant spiral galaxy M101, known as the Pinwheel Galaxy, […]

Photo of the Week for July 18, 2014

The giant spiral galaxy M101, known as the Pinwheel Galaxy, is located near the end of the Big Dipper’s handle. With a diameter of about 170 thousand light-years, M101 is larger than our galaxy. It is about 25 million light-years distant. The pinkish regions in the spiral arms are star-birth nebulas.

Pinwheel Galaxy by Brian McGaffney
The Pinwheel Galaxy (Brian McGaffney)

Observing the spiral-arm structures seen in this detailed image by Brian McGaffney requires a very large telescope. McGaffney used a 17-inch scope equipped with a Alta U16M CCD camera for this image, captured at his observatory south of Bancroft, Ontario. The image utilizes a total exposure of around 14 hours acquired over five nights.

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