Fun Fact: So far as we can tell, Dark Matter does not interact directly with either photons or with baryonic matter. As a result, it can not be seen nor touched nor tasted nor felt. But what distinguishes such a material from abject fiction is that it does find a way to interact, and that is gravitationally.
We can observe Dark Matter in a very course fashion (galactic-scale distribution) by detecting the otherwise unaccounted for mass at those scales, such as due to gravitational lensing around galaxies and the orbital velocities of stars at various radii from the centers of galaxies. We can also observe the distribution of this extra, unaccounted for mass when galaxies collide with one another, and as predicted by this different interaction profile we find that it remains far more diffuse than the nuanced distribution of easily accounted for baryonic matter.
Now thanks to the Gaia Telescope finishing it’s mission and dumping embarrassing quantities of fresh new data into the laps of astronomers, we have a clear enough picture to measure the behavior of dark matter in our own galaxy down to resolutions as small as hundreds of light years and watch filaments of material literally move the stars across the heavens like the paintbrush of God.
But to sum up, just because you cannot see a thing or hear it or smell it does not mean that it can’t flow right through your body like a gale wind at speeds greater than any object mankind has ever propelled in a fashion that can be measured and corroborated by easily replicable scientific observation.
It only boils down to the character of influence such a presence has. :J
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