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Types of DSO's:

• Star clusters
  • Open clusters
  • Globular clusters
• Nebulae
  • Bright nebula e
    • Emission nebulae
    • Reflection nebulae
  • Dark nebulae
  • Planetary nebulaA planetary nebula is an astronomical object consisting of a roughly spherical glowing shell of gas formed by certain types of stars at the end of their lives. Characteristics Physical characteristics A typical planetary nebula is roughly one light year ae
• GalaxiesThis article is about a celestial body. For alternate meanings see galaxy (disambiguation). Spiral Galaxy ESO 269-57 is about 150 million light-years away and 200,000 light-years across. Stars are almost always found in collections called galaxies togethe
• QuasarA quasar (from quasi-stellar radio source is an astronomical object that looks like a star in optical telescopes (i. it is a point source), and has a very high redshift. The general consensus is that this high redshift is cosmological, the result of Hubbls

These are classified by the Messier catalogue of 110 objects and the much more comprehensive New General CatalogueThe New General Catalogue NGC is the most well-known catalogue of deep sky objects in amateur astronomy. It contains nearly 8,000 objects, known as the NGC objects . The NGC is one of the largest comprehensive catalogues, as it includes all types of deep which contains nearly 8000 objects. Many sets of these and other objects from more specialised catalogues such as the UGCThe Uppsala General Catalogue of Galaxies (UGC) is a catalogue of 12921 galaxies visible from the northern hemisphere. The catalogue includes essentially all galaxies north of declination -02°30' and to a limiting diameter of 1. 0 arcminute or to a limiti are used by amateurs as a test of their observing skills and their equipment. The so called Messier marathonMessier marathon is an attempt undertaken by amateur astronomers to find as many Messier objects as possible during one night. The Messier catalogue consists of 110 relatively bright deep space objects ( galaxies, nebulae, and star clusters). The number os occur only at a specific time of year when observers try to spot all 110 objects in one night. A much more demanding test known as Herschell's 400 is designed to tax larger telescopes.