One of the great discoveries of the 20th century was the expansion of the universe, what is the actual?

Question

....evidence for this expansion?

Answer 1

All but a couple of galaxies recede from us, and the recession rate increases linearly with distance.

Answer 2

The expansion of the universe is not a fact it is a theory.
The universe is a finite entity so it can't be in a state of accelerated expansion.
The expanding universe is predicated on the interpretation of the Hubble constant,something else could exhibit the same red shift.
If a galaxy were in a state of accelerated collapse, light
emitted from it would be shifted to the red and interpreted as a recessional velocity.
The same red shift would occur if the galaxy was observed from the other side or any other angle.
It makes no sense that a galaxy would remain the same and accelerate away forever.
The universe is an incident with a beginning and an end,when it ends it will never occur again.

Answer 3

Evidence aside, the Hubble constant, 71 km/sec/megaparsec, has an MKS equivalent. In standard MKS units, it is equal to 2.4*10^-18/sec; in other words, every second the distance to any very distant galaxy increases by a factor of 1+2.4*10^18. Differently stated, every second (2.4*10^-18 meter)^3 = 10^-55 cubic meter of new space mysteriously appears within every cubic meter of the universe. This does not cause any expansion of objects; if it did our meter sticks would expand, so we would perceive no expansion.

For my full explanation of where the new space comes from, try the link below. I don't think you'll find a more meaningful explanation of it anywhere.

Answer 4

The best evidence is the observed recession of distant galaxies as measured by the red shift of their emitted light. After many years of study, it's been found that the farther away one of these receding galaxies is the more red-shifted will be its light, therefore the faster it's moving away. Actually for every megaparsec (..3,261,688 light years..) farther away a galaxy is its recession velocity is 70 km/sec greater.

Answer 5

Direct observation of the movement of galaxies relative to ours. We can see them move, and measure the speed. As the previous answerer said, the speed of the galaxies is proportional to the distance away from us. The farther away, the faster they are moving.

Answer 6

The spectral shift or DOPLER effect.

The front side compresses and the back side expands due to speed and direction.

Hubble documented this.

Answer 7

The Doppler effect has been accepted as the explanation.