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Tatti_luck OP t1_iugcc6u wrote

Reply to comment by Varlex in Please explain in simple words by Tatti_luck

I understand that the light traveling to us would be what it was years ago compared to their current relative position. But how do we know that currently position is much further than we are viewing? Would we be seeing the increase in distance in real time?

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Varlex t1_iuh34kr wrote

It's the red shift.

There are 2 models for light: particles and wave. Both are equal and correct.

Because room is expending, the wave length increase. Depending how much it increase we can calculate how long it's needed and can calculate the different distances with this information.

(It's like the Doppler effect with sound)

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