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Are galaxies are really moving away.Or galaxies are stationary but space-time expends so galaxies move with it ? Or maybe they could be same thing ?
Are Galaxies Moving or is Space-Time Expanding?
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- Thread starter Arman777
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In summary, the conversation discusses whether galaxies are moving away from each other or if they are stationary but being carried along by the expansion of space-time. It is mentioned that this is a coordinate-dependent statement and in "local" normal coordinates, galaxies are moving away. The concept of metric expansion is also brought up, where there is no proper motion of far distant galaxies with respect to the Earth. The analogy of a rubber belt with balls on it being pulled in opposite directions is used to explain the process.
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Google "metric expansion". There is no (well, very little and for a different reason) proper motion of far distant galaxies with respect to the Earth, it's metric expansion.
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This is a coordinate dependent statement. In "local" normal coordinates, galaxies are certainly moving away.phinds said:
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Orodruin said:
Like here its metric expention I guess.Here galaxies are standing still but universe expends so galaxies are moving with a velocity.Galaxies are moving away with a velocity v but not for they have a speed itself,Space time carries galaxies ?
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acidmatic
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Take a rubber belt and put 5-6 balls on it as if it's a kind of bead. Then pull the belt in opposite directions. You'll see the process itself.Arman777 said:
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acidmatic said:
I understand..
1. How do we know that galaxies are moving?
Scientists use a variety of methods to determine the movement of galaxies, such as measuring the redshift of light from galaxies and observing their trajectory over time.
2. What causes galaxies to move?
Galaxies can be influenced by a variety of factors, such as the gravitational pull of other galaxies, dark matter, and the expansion of the universe.
3. Are all galaxies moving at the same speed?
No, the speed at which a galaxy moves depends on its location, size, and the forces acting upon it.
4. Can galaxies collide with each other?
Yes, galaxies can collide and merge with each other due to their gravitational interactions. This can result in the formation of new galaxies.
5. How does the movement of galaxies affect the universe?
The movement of galaxies plays a crucial role in the evolution of the universe. It helps to shape the structure of the universe and influences the formation of stars and other celestial bodies.
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