Saturday, April 14, 2018

Galaxies - the structure of the universe



- 2060  -   Galaxies -  the structure of the universe. The universe forms in filaments and threads like an enormous cosmic web.  Today's computers have tried to replicated the formation of galaxies as interacting particles obeying the laws of physics and mathematics.  The Hubble telescope is measuring the expansion rate of distant galaxies.
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-----------------------------  2060  -  Galaxies -  the structure of the universe
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-  The universe forms in filaments and threads like an enormous cosmic web.  Why?  Galaxies form in clusters along this web.  Between the clusters of galaxies are giant voids.  Our own Milky Way galaxy is among 100,000 galaxies in the Laniakea Supercluster.  Laniakea means "immeasurable heaven" in the Hawaiian language. This supercluster spans 500,000 lightyears in length. 
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-  The Laniakea Supercluster was discovered in 2014.  These type discoveries started in 1874 when 59 nebulae were found to have the same orientation with respect to the Milky Way.  No one paid attention to this discovery until 1968.  Then astronomers realized that giant elliptical galaxies populated the center of galaxy structures.  And, the outer elongated stream of galaxies are all aligned in the same direction.  Today's astronomy confirms this mirroring behavior and that it has existed for billions of years.
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-  The flattened shape of galaxies is due to their rotation.  Stars spread into a thin disk as the galaxy rotates.  Our Sun travels 500,000 miles per hour in its rotation and it has  completed 24 trips around the Milky Way since its birth. 
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-  Today's computers have tried to replicated the formation of galaxies as interacting particles obeying the laws of physics and mathematics.  It is possible to simulate galactic evolution in space with unprecedented detail using trillions of particles to represent stars and dark matter.  Astronomers run the simulation forward in time to get the predicted distribution of galaxies.  Then compare that to observation.  We are trying to learn how the universe reached its present state. 
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-  These simulations show that big galaxies grow by cannibalizing smaller ones.  These mergers occur along defined directions called filaments.  Gravity's relentless tug will slowly align galaxies with their surroundings. 
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- Quasars are parallel to each other over distances of billions of lightyears.  Quasars are galaxies with blackholes at their centers.  They all share the same orientation as the surrounding filament structure. 
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-  There is definitely a truly remarkable coherence to the structure of our universe.  
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-  The Milky Way Galaxy is moving much more quickly than any of  the simulations show it should.  The only way to match this behavior is to add a "dipole repeller" in the area of void space.  Expanding space means the further away a galaxy is the faster it appears to recede from us. 
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-  Each individual galaxy has an expanding space velocity and a "peculiar velocity" due to the unique gravitational influence in its unique environment.  Our Local Group of galaxies,   including the Milky Way and the Andromeda,  are moving at 631 kilometers per second, (1,411,507 miles per hour) relative to the "Hubble flow" of many galaxies.  There must be some form of gravitational repulsion needed to explain this. 
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-  An under dense region of neighboring space could effectively act as a gravitational repeller.  Gravity is never repulsive but a less attraction force in one direction over all other directions behaves indistinguishably from a repulsion.  The result is that we move through space in our own peculiar fashion.
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-  When we have a sample of one everything is likely to appear the same. 
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-  The Hubble telescope is measuring the expansion rate of distant galaxies.  The result is that for every 3.3 million lightyears farther a galaxy is way it is moving 67 kilometers per second faster.  (  or,  13 miles per second for every million lightyears), (or,  49,406 miles per hour for every million lightyears distance)
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-  95% of the Universe is shrouded in darkness.  Maybe dark energy is accelerating the galaxies? This means that acceleration is not constant but it too is accelerating.  95% of our knowledge is shrouded in darkness too.  We have s lot more to learn. 
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-  Other reviews about galaxies:
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-  2046  -  How galaxies form and grow.  How blackholes shape the cosmos.   
This review lists 14 other reviews about galaxies.  Including:
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-  1994  -  How many galaxies are there?
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-  13 -    How to weigh a galaxy?
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-  892  -  How galaxies grow up?
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-  1121  -  Why do we think there is a blackhole at the center of our galaxy?
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-  1120  -  What happens when galaxies collide?
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 -------------------------   Saturday, April 14, 2018   --------------------------------





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