Astronomy Picture of the Day . ... Credit Copyright: Rogelio Bernal Andreo Explanation: The best known asterism in northern skies, The Big Dipper is easy to recognize , though some might see The Plough. ... Dubhe , alpha star of the dipper's parent constellation Ursa Major is at the upper right. ... Publications with keywords: Ursa Major - Big Dipper - constellation - asterism . Publications with words: Ursa Major - Big Dipper - constellation - asterism . ... Starry Night Over the Rhone . ...