Is it possible the most of space of the universe are filled by frozen matters since there's no heat sources between intergalactics space?

As a chemist, I can tell you that hydrogen and helium do not combine to form a neutral compounds under any circumstances yet devised by chemists. However a stable ion - HeH+ is known.

Now if there were such compounds in any quantity, which there would have to be to represent a fair proportion or all of the dark matter, their spectra would be glaringly obvious. At any temperature above absolute zero, all substances emit or absorb radiation and that absorption or emission is closely tied to their chemical composition and structure. There is nowhere in the Universe at absolute zero though some areas are pretty chilly.

Enough is known about the spectra of simple and even relatively complex chemical compounds to predict some of the spectrum of an hypothetical compound. See for instance "Woodward's rules" and the "Nephelauxetic parameters" which are commonly used in spectroscopy by chemists. So propose a simple compound, or even something as relatively complex as the amino acid glycine, and the spectrum can be predicted easily using such calculations to within few percent. Now search the optical and radio bands and see if they are there. Glycine has been detected in gas and dust clouds along with several simple compounds.

The most prominent features of dark matter are that it does not interact with light or standard matter except by gravity.

Nice try though.

It doesn't need to be liquid or solid. Gaseous hydrogen will do fine. Molecular hydrogen is the most abundant form of matter in the universe and is the most sensible candidate for darm matter. Cold H2 is extremely difficult to detect spectroscopically but we have found enough of it to account for a spiral galaxy's missing mass in a warmer galaxy than our own:

http://web.archive.org/web/20100702194353/http://h...

The reason that the scientific consensus says it can't be baryonic matter is that, if it was, it would give off thermal radiation of around 3K — the equilibrium temperature of interstellar space. Well, that's exactly what we see coming from all around us, the so-called "cosmic microwave background". The problem here is that the big bang theorists had already decided that this radiation is the left-overs of their hallowed creation event and they were not gonna admit that they'd got that wrong, so they invented this metaphysical non-baryonic [and non-emitting] stuff in a desperate attempt to keep the big bang theory alive and named it "dark matter".

no