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Hello2

So there is no need for bigbang-theory?

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If there is a redshift of light in the universe because of distance,

then galaxies that move away with constant velocity seem to move away with acceleration.

So there is no need for bigbang-theory?

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12 minutes ago, Hello2 said:

If there is a redshift of light in the universe because of distance,

The redshift is due to the expansion of space.

12 minutes ago, Hello2 said:

then galaxies that move away with constant velocity seem to move away with acceleration.

The recession velocity is proportional to the distance, due to expansion.  There is no movement through space so there is no acceleration.  The expansion of space has began to increase but that is not the reason for the red shift.

You need to be a bit clearer what you are asking.

12 minutes ago, Hello2 said:

So there is no need for bigbang-theory?

The BBT matches observations.

Edited by Bufofrog

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There still is a need for the BB. Extrapolation backwards of receding galaxies makes inevitable some kind of bang.

The cosmic background radiation, the remnant of the explosion, is the best evidence. It has exactly the frequency spectrum of light filling all of space and continually cooling off (at different rates following known phases of cooling) for 13.7 billion years give or take.

So yes, there must have been a big bang.

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15 minutes ago, Hello2 said:

If there is a redshift of light in the universe because of distance,

 

then galaxies that move away with constant velocity seem to move away with acceleration.

 

So there is no need for bigbang-theory?

 

If the universe were not expanding, we would not see any red shift with distance.   Thus the increasing red-shift we see with increasing distance is evidence that the universe is expanding over time, and was smaller in the past than it is now.  If we extrapolate back in time, we get the  very dense, very hot state of the Big Bang.

The acceleration of the the expansion over time is evidenced by the exact relationship between red-shift and distance.

There are three possible scenarios for an expanding universe. All of them will show a red-shift:

Case 1:  expansion slows over time

Case 2: expansion remains constant over time.

Case 3: expansion speeds up over time.

Only in case 2 will there be a perfect direct relationship between distance and red-shift, where doubling the distance exactly doubles the red-shift.

In the other two cases,  doubling the distance results in a red-shift that is not an exact doubling.  Whether it is less than double or more than double distinguishes between the two cases.

We have found that the red-shift distance ratio indicates that the universe's expansion rate has been increasing over time, and thus the rate of the expansion is accelerating.

 

 

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