Why should you say that Brahman will always remain unknown?
Pardon? Where have I ever said that?
How does "Because clearly a photon is an object of knowledge perceivable to the mind. Hence, not Brahman." equal 'Brahman will always remain unknown'?
Please do not put words in my mouth, or at least ask me to clarify my position before you misunderstand it.
What I
actually said was that Brahman cannot be known through the scientific method. That is not the same as saying Brahman can never be known. The scientific method which consists of repeatable and observable experimentation on objects known via the sense perception and inference is not the appropriate means of knowledge for knowing Brahman. It is not the right pramAna. That's not to say there is no pramAna.
Brahman
can be known. Brahman
can be known through Vedanta. That's the point of Vedanta. Prolonged shravaNa, manana and nididhyAsana on the Vedanta scriptures (in conjunction with a mind highly purified through karma, meditation etc) removes the ignorance which veils one's true nature
as Brahman. There are some who say that these are auxiliary means and samAdhi is the primary means (my personal opinion lies between the two views), but whatever be the case there is general agreement that Brahman is not an object to be known through sense perception and inference. In order to know anything we have to wield the appropriate means of knowledge for knowing it. In order to know colour, form and shape, I need light in conjunction with the eyes. I cannot know colour, form, and shape through the sense of taste, for example. In the same way, there is a specific means of knowledge appropriate for brahma vidya, and that means is not pratyaksha/anumAna which are the basis of the scientific method.
There are some things that the scientific method can neither prove nor disprove, owing to the limitations of the scientific method. This includes such things as God, as reincarnation, as devas, as the Atma. Just because science cannot prove nor disprove these things, we should not therefore reject them as non-existent. There are more existent things than there are objects detectable to the senses organs and therefore available for inference. It is an extremely limited viewpoint to assert that only those things which can be known via sense perception and inference are the only things that exist. This assertion discounts the Vedic texts as valid pramAna, since the Vedic texts reveal the existence of many things not knowable to empirical methodology. We should therefore let the Vedic texts stand as an independent and valid pramAna, and not worry about what science can or can't prove about the entities revealed therein.
Further, Shankara has said that if one pramAna reveals that fire is hot, the shruti cannot say that fire is cold. In other words, one pramAna cannot interfere with what is revealed by another pramAna. Therefore, whatever is discovered via the scientific method does not contradict what is revealed by the shruti, and what is revealed by the shruti does not contradict the discoveries of the scientific method. They are both valid, independently. We need not be concerned about updating Vedanta to fit into modern science. By the same token, I do not believe we should focus our energies on cramming scientific discoveries into Vedanta. I think it does disservice to both.
Science has revealed a lot about what things are constituted of. Is not that the definition of Brahman?
The definition of Brahman is
sat-chit-ananda, satyam-jnanam-anantam, neti-neti, etc.
We have an obligation to see what scientists say, otherwise time would leave us behind.
Scientists have said absolutely nothing whatsoever about Brahman. Brahman is not their area of expertise!