25/2/2016
ENGLISH PAGE Mixed Prepositions 16
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Mixed Prepositions 16
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A galaxy is a massive, gravitationally bound system that consists
stars, an
interstellar medium of gas and dust, and dark matter. Typical galaxies range
dwarfs with as few as ten million stars up
stars, all orbiting a common center
giants with one trillion
gravity. Galaxies can also contain a
large number of multiple star systems and star clusters as well as various types of
interstellar clouds. Historically, galaxies have been categorized according
their apparent shape. Interactions between nearby galaxies, which may ultimately
result
a galaxy merger, may induce episodes of significantly increased star
formation, producing what is called a starburst galaxy. There are probably more
than a hundred billion galaxies
a thousand
separated
the observable universe. Most galaxies are
a hundred thousand parsecs
one another by distances
diameter and are usually
the order of millions of
parsecs. Intergalactic space, the space between galaxies, is filled
tenuous gas with an average density less than one atom
a
cubic meter.
There is some evidence that supermassive black holes may exist at the center of
many, if not all, galaxies. These massive objects are believed to be the primary
cause of active galactic nuclei found
Way galaxy appears to harbor
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the core of some galaxies. The Milky
least one such object within its nucleus.
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25/2/2016
ENGLISH PAGE Mixed Prepositions 16
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