DWARF GALAXY Meaning and
Definition
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A dwarf galaxy is a term used in astronomy to describe a small celestial object that possesses similar characteristics to a regular galaxy but is significantly smaller in size. It is often defined as a galaxy with a relatively low mass, typically containing only a fraction of the stars and other celestial objects found in larger galaxies.
Dwarf galaxies are abundant in the universe and are known to exist in various shapes and forms, such as elliptical, spiral, or irregular. They are usually found in close proximity to larger galaxies and are often considered satellites of these more massive galaxies.
Due to their diminutive size, dwarf galaxies have lower levels of luminosity and less gravitational pull compared to larger galaxies. This feature makes them intriguing subjects of study for astronomers, as they offer insights into the early stages of galaxy formation and evolution.
Despite their small size, dwarf galaxies can also possess significant amounts of dark matter. This invisible and elusive substance plays a crucial role in galaxy formation and structure. Understanding the distribution and influence of dark matter in dwarf galaxies contributes to our overall comprehension of the universe's composition and the processes involved in its organization.
In summary, a dwarf galaxy refers to a small celestial object that resembles a typical galaxy but is much smaller in scale. Through their study, astronomers gain knowledge about galaxy formation, evolution, and the role of dark matter in the universe.
Etymology of DWARF GALAXY
The word dwarf in dwarf galaxy comes from the Old English word dweorg, which means a small or undersized creature. It is often associated with mythical beings that are smaller in size compared to regular humans. The term dwarf in the context of astronomy was first used in the mid-20th century to describe galaxies that are smaller and less massive than typical galaxies. The addition of galaxy refers to a system of stars, gas, and dust held together by gravity, with the term galaxy originating from the Greek word galaxias, meaning milky circle.
