<p>In other words, is the assumption, that redshift is caused by universe expansion, definitive? Or are other theories still being considered? Could it be, that light is being slowed down by dark energy, dark matter, massive objects, etc., as it travels through space? </p>

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2019-05-02T06:17:57.867Z
@Chappo, answers to the older, very similar question (https://astronomy.stackexchange.com/questions/1973/is-there-another-explanation-apart-from-the-doppler-effect-for-the-redshift-ob) fit mine quite well. Thanks.
marko-36
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2019-05-02T09:17:17.363Z
That's great, I'm glad our site has been able to provide the answers you needed :-)
Chappo Hasn't Forgotten
<expansion><redshift>
Is it possible for redshift to be caused by light being somehow slowed down during travel?
marko-36
# Is it possible for redshift to be caused by light being somehow slowed down during travel?

(Asked by: username_0 on 2019-05-01)

In other words, is the assumption, that redshift is caused by universe expansion, definitive? Or are other theories still being considered? Could it be, that light is being slowed down by dark energy, dark matter, massive objects, etc., as it travels through space?

**Tags:** expansion, redshift

> **Comments:**
> **username_0**: @Chappo, answers to the older, very similar question (https://astronomy.stackexchange.com/questions/1973/is-there-another-explanation-apart-from-the-doppler-effect-for-the-redshift-ob) fit mine quite well. Thanks.  
> **username_1**: That's great, I'm glad our site has been able to provide the answers you needed :-)  

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