M81 and M82M81 is a spiral galaxy in the constellation Ursa Major. It is also called Bode nebula, in honor of its discoverer Johann Elert Bode.M82 is also a spiral galaxy. It was, however described as an irregular galaxy for quite a long time due to its peculiar shape.
M57 - Ring nebula in LyraThe so called ring nebula is located in the constellation Lyra. It was discovered by Antoine Darquier de Pellepoix [1] in 1779. In the same year Charles messier entered it into his catalog as number 57. Its NGC designation is NGC 6720. The object is a so called planetary nebula, most likely the most well known. Really good pictures can be found here [2]or here[3] References:[1] Wikipedia - Messier 57[2] Astronomy Picture of the Day [3] Verein Antares 
M13 - Globular Cluster in HerculesM13 is a globular cluster, a spherical collection of gravity bound stars orbiting the galactic core as a sattelite[1] . It was discovered in 1714 by Edmond Halley [2]Better pictures than the one on the left can be found eg. here[3] or here[4] References:[1] Wikipedia - Globular Cluster[2] Wikipedia - M13 [3] Bernhard Hubls page [4] Astronomy Picture of the Day 
M51 - Whirlpool GalaxyM51 in the constellation Canes Venatici is a spiral galaxy discovered by Charles Messier in 1773. It was however 1845 until Lord Rosse first detected its spiral pattern[1]. It interacts with its its companion galaxy NGC 5195[2]A rather nice amateur picture is shown here[3] References:[1] Robert Burnham jr., "Burnham's Celestial Handbook - Volume 1" (1978), p. 369[2] Wikipedia - Whirlpool Galaxy [3] Verein Antares 
NGC 6888 - Crescent NebulaThe Crescent Nebula is a so called emission nebula in the constellation Cygnus[1].Have a look at a very nice picture from the Archives of Astronomy picture of the day[2] References:
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