[tophat9000]

given that there is no accepted mechanism for how gravity works at all, never mind how it would affect something with zero mass like light.

.. That's irrelevant

Not knowing how the mechanism works..it independent of the observed effect ...

Are you contending gravity doesn't exist Just because we don't know how it works... I don't think so

Things are observed before we know how they work...

Our knowing how something works does not at that point bring it into existence....

So simple question: Has light been observed to be bent by gravitation effect... whether we understand the mechanism or not?

[thoughtomator]

> Has light been observed to be bent

Yes.

> by gravitation effect... whether we understand the mechanism or not?

Speculative, unproven.