Other times I have spoken of cosmic dust. Cosmic dust is, as the name suggests, tiny particles of size 0.1 mm peak material expelled by stars (among other things). Mainly usually ferrous materials.
There is, say, in all dimensions, including planets, between stars and between galaxies … is what has gravity moves and distributes the dust everywhere.
In addition, as matter is, cosmic dust also generates gravity, making it an important glue between different stars. That is, it is like the mortar between the bricks (without the dark, of course, a matter which “weighs more”).
How do we know if cosmic dust where there is so little ?. Well there are several ways. The first is at a glance: or very dark areas with high concentrations that absorb light (and I showed a picture) and infrared (passing through it) is what is behind or dust is concrete material that looks certain wavelengths (eg, is radioactive) or (which I show in the picture) reflect the starlight around the (why is that most ferric).
Previously it was thought that, as I said, this mortar was the amount of material missing between things and their gravity was what was called “what is lacking”. That is, before the existence of dark matter simply thought it was cosmic dust. Unfortunately after “I weigh” (more or less) it was found that even in areas where this was not massive enough to create the necessary seriousness.
Even with all this, there are still scientists who think they just have not seen all the dust because we have no methods or ways to look at its composition, hence the dark matter (until it is detected) this tightrope.
And what a roll that I have counted for a picture where you only see something of cosmic dust.