Spiral galaxy Messier 106 is unusual. It has four spiral arms instead of the usual two. The normal pair are the ones with the string of blue towards their ends – hot young stars in an early stage of life.
The Orcadian's Orkney Sky Notes column is ten years old. The column, produced by Rousay astronomer John Vetterlein, has become not only an essential guide to the Orkney night sky but also an ideal way to learn about astronomy.