University of Miami Astronomy Club

Deep Sky Objects

Deep-sky objects (DSOs) and Deep Sky (which differs from deep space) are informal terms used by amateur astronomers to describe mostly faint astronomical objects outside the solar system, such as star clusters, nebulae or galaxies. These objects are hundreds to billions of light-years distant from Earth.

Nearly all clusters and nebulae are contained within galaxies, and there are a number of galaxies visible to the naked eye (having an apparent magnitude better than 6). They are, in order of closeness, the Milky Way, the Large Magellanic Cloud (approximately 160,000 light-years away), the Small Magellanic Cloud (about 200,000 light-years away), and the Andromeda Galaxy, (about 2.5 million light-years away).

Source: http://en.wikipedia.org/wiki/Deep_sky_objects

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