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Author Topic: What are Hubble Galaxies? How many of them are there?  (Read 2805 times)

Offline chris

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What is a Hubble Galaxy, and what distinguishes it from any other type of galaxy?


 

Offline DoctorBeaver

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What are Hubble Galaxies? How many of them are there?
« Reply #1 on: 18/12/2008 09:32:57 »
As far as I am aware "Hubble" does not refer to a particular type of galaxy. It is a classification of galaxy types.
 

Offline Soul Surfer

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What are Hubble Galaxies? How many of them are there?
« Reply #2 on: 19/12/2008 21:59:20 »
Chris could you clarify your question by giving the context in which you heard it. I am not aware of it as an expression in general use and I can think of at least three totally different reasons why it might be possible to tag a galaxy with that qualifier.

These are:

1 a galaxy imaged by the Hubble telescope

2 one of the galaxies used by Hubble in his observations of red shift.

3 a galaxy corresponding to one of the morphplogical classification  of galaxy types as above.

 

Offline chris

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What are Hubble Galaxies? How many of them are there?
« Reply #3 on: 19/12/2008 22:35:27 »
Someone phoned up and asked me "What are Hubble Galaxies? How many are there?"

Chris
 

Offline Soul Surfer

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What are Hubble Galaxies? How many of them are there?
« Reply #4 on: 19/12/2008 23:25:55 »
Googling "hubble galaxies" suggests that answer 1 is the most likely.  there is this project called "galaxy zoo" where people are asked to look at a set of images of very distant galaxies and classify them according ot a range of types.

If that is the case there are many millions of them it is estimated that there are about as many visible galaxies as there are stars in our galaxy ie 100 billion!   in most deep space pictures the number of visible galaxies vastly outnumbers the number of stars.  This is not true close to the milkey way because the dust in our galaxy obscures the dostant galaxies.
 

Offline RD

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What are Hubble Galaxies? How many of them are there?
« Reply #5 on: 22/12/2008 00:22:31 »
« Last Edit: 22/12/2008 00:24:50 by RD »
 

Offline Mr. Scientist

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What are Hubble Galaxies? How many of them are there?
« Reply #6 on: 24/12/2008 20:43:26 »
What is a Hubble Galaxy, and what distinguishes it from any other type of galaxy?

Our Galaxy, the Milky Way has something like 200 billion stars, being 100,000 lightyears across and 10,000 lightyears thick - light years measure how far light travel in one year - light will travel around 65.5 billion miles in one year.
   It takes 222 million years for our sun to orbit the galactic center. Our galaxy is one of an estimated 50 billion in the universe, where some galaxies have grouped with 12 other galaxies, whereas others have grouped in thousands! They make up 'supergalaxies', which are thought to have supermassive black holes at their centers.   

The universe contains about 200 billion star systems, some with nearly a hundred times greater in mass. There is, approximately by observation, 10^80 particles in the observable universe. All of these are Hubble Galxoies, all receeding and approaching each other, in a great swell of momentum, scattered since the dawn of time.

We will, eventuially crash into Andromeda. Relativistically speaking, we are moving relative to Andromeda at speeds liken 19,000 m/p/h, and whilst this may seem really fast, Andromeda is moving relative to us at even faster speeds, at 300,000 m/p/h, and yet, this is is quite fast in comparision. These are relativistic speeds, the kind which wen  find even mass distorted by the energy content of the moving system.
 

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What are Hubble Galaxies? How many of them are there?
« Reply #6 on: 24/12/2008 20:43:26 »

 

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