We get Redshifted light from all the directions. What are the possible interpretations?

We are getting redshifted light from everywhere.

Now there are two possibilities:

1- Space is expanding at every scale and universe is expanding like a balloon. (far fetched idea – we should expect such an idea from pseudoscience or flat-earth type people).

2- Only light is getting redshifted per unit of distance. (Sensible idea – should have been expected from mainstream).

Mainstream people of Physics accuse critics of the Big Bang Theory as ‘cranks’ and ‘crackpots’. They argue that discipline of Physics is prone to attacks from ‘cranks’ (for unexplained reason) whereas this is not the case with other branches of science such a Biology.

My response to them is that when mainstream Physics itself is ‘cranky’ then we feel the need to come forward. Other branches of science like Biology etc. are not ‘cranky’ themselves so we do not criticize them. It is modern Physics which has challenged human commonsense and at least my response to Physics is like answer to Modern Physics by the commonsense.

Anyways, to the above narrated two possibilities, I received following objection:

“If what you’re saying was true, then andromeda should also be redshifted, since it is far away from us, but it’s not, because it’s coming towards us.

We get the same thing with binary stars, when they are approaching they are blue, when they’re going away they’re red.

The same happens with spiral galaxies, the side spinning towards us is closer to blue, and the side going away is closer to red.”

My response was following to which I received no further reply:

“Light is getting redshifted per unit of distance.”

The rate of redshifting of light is very low. Within the range of local group of galaxies, the “light’s inherent redshift” can be lower than “Doppler’s Blueshift” due to actual approaching speed of galaxies of local group.

Same applies to binary stars where Doppler’s interpretation is correct.

But after a sufficient distance, inherent redshift of light always overcomes Doppler’s blue shift due to actual motion so after a considerable distance, we always get redshifted light.

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First time I heard this explanation. Very helpful, thanks!