Science and Tech
In
just our noticeable universe we estimate there are over two trillion galaxies!
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There are four main
classes of galaxies: elliptical, spiral, barred spiral, and irregular.
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These varieties of
galaxies are additional divided into subcategories whereas at a similar time
alternative varieties of galaxies exist supported their size and different
unique options.
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Spiral Galaxy the most
common sort of galaxy found throughout the universe is that the spiral galaxy.
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Around seventy seven
per cent of the galaxies observed by man are spiral galaxies.
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A good example of this
kind is that the andromeda galaxy.
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Around two-thirds of
all spiral galaxies have a bar-like structure – so theyre classified as barred
spiral galaxies.
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Our galaxy, the milky
way is an example of this kind of galaxy.
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They have a flat,
spinning disk with a central bulge nearby by spiral arms.
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The spinning motion
reaches speeds of up to 100 of kilometers/miles per second.
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The bulge placed within
the center is created up of older, dimmer stars, and is assumed to usually
contain a supermassive black hole.
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Elliptical Galaxies
Elliptical galaxies have an elongated spherical shape and lack a nucleus or
bulge at the middle.
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Although theres no
nucleus, the galaxy remains brighter within the center and becomes less bright
toward the outer edges of the galaxy.
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Their light is
dominated by older ruddy stars.
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They appear to
conjointly lack spiral arms.
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the stars, gases and alternative
materials are unroll throughout an elliptical galaxy.
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The rarest variety of
galaxies is that the elliptical double-ringed galaxy.
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PGC 1000714 is an
example. Estimates recommend that around 0.1% of galaxies are this kind.
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It is occasionally named
the Hoag-type galaxy.
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Elliptical galaxies are
typically comprised of very old stars or stars with low mass.
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They make up around
10-15% of galaxies within the Virgo Supercluster, a supercluster of that we are
a part of.
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They are very dim in
comparison with the terribly bright spiral galaxies.
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The largest galaxies
are typically huge elliptical galaxies, containing a trillion or even more
stars.
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They span as much as 1
million light-years across – ten times as much because the milky way.
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Curious enough, the
littlest galaxies are the elliptical varieties. Irregular Galaxies Irregular
galaxies havent any definite shape, although theyre in constant motion like
all different galaxies.
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They have a chaotic
appearance as they don’t appear to possess a nuclear bulge or traces of spiral
arms.
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Some irregular galaxies
were once spiral or elliptical galaxies however were misshapen by an uneven
external force of gravity.
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Irregular galaxies are usually commonly, and
collectively they create up about a quarter of all the galaxies.
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The oldest and farthest
galaxy ever discovered is an irregular variety of galaxy known as GN-z11. its
thirty two billion light-years / 9.8 billion parsecs faraway from United
States.
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its estimated that the
galaxy formed simply around four hundred million years when the large Bang.
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Lenticular Galaxies
they seem like cosmic pancakes, fairly flat and featureless within the night
sky.
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These galaxies are
often thought of because the “in between” of spiral and elliptical galaxies.
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the majority of star
formation has stopped however lenticular galaxies will still have significant
amounts of dirt in them.
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